include/diaspora.php

   1 <?php
   2 /**
   3  * @file include/diaspora.php
   4  * @brief The implementation of the diaspora protocol
   5  */
   6
   7 require_once("include/items.php");
   8 require_once("include/bb2diaspora.php");
   9 require_once("include/Scrape.php");
  10 require_once("include/Contact.php");
  11 require_once("include/Photo.php");
  12 require_once("include/socgraph.php");
  13 require_once("include/group.php");
  14 require_once("include/xml.php");
  15 require_once("include/datetime.php");
  16 require_once("include/queue_fn.php");
  17
  18 /**
  19  * @brief This class contain functions to create and send Diaspora XML files
  20  *
  21  */
  22 class diaspora {
  23
  24         /**
  25          * @brief Return a list of relay servers
  26          *
  27          * This is an experimental Diaspora feature.
  28          *
  29          * @return array of relay servers
  30          */
  31         public static function relay_list() {
  32
  33                 $serverdata = get_config("system", "relay_server");
  34                 if ($serverdata == "")
  35                         return array();
  36
  37                 $relay = array();
  38
  39                 $servers = explode(",", $serverdata);
  40
  41                 foreach($servers AS $server) {
  42                         $server = trim($server);
  43                         $batch = $server."/receive/public";
  44
  45                         $relais = q("SELECT `batch`, `id`, `name`,`network` FROM `contact` WHERE `uid` = 0 AND `batch` = '%s' LIMIT 1", dbesc($batch));
  46
  47                         if (!$relais) {
  48                                 $addr = "relay@".str_replace("http://", "", normalise_link($server));
  49
  50                                 $r = q("INSERT INTO `contact` (`uid`, `created`, `name`, `nick`, `addr`, `url`, `nurl`, `batch`, `network`, `rel`, `blocked`, `pending`, `writable`, `name-date`, `uri-date`, `avatar-date`)
  51                                         VALUES (0, '%s', '%s', 'relay', '%s', '%s', '%s', '%s', '%s', %d, 0, 0, 1, '%s', '%s', '%s')",
  52                                         datetime_convert(),
  53                                         dbesc($addr),
  54                                         dbesc($addr),
  55                                         dbesc($server),
  56                                         dbesc(normalise_link($server)),
  57                                         dbesc($batch),
  58                                         dbesc(NETWORK_DIASPORA),
  59                                         intval(CONTACT_IS_FOLLOWER),
  60                                         dbesc(datetime_convert()),
  61                                         dbesc(datetime_convert()),
  62                                         dbesc(datetime_convert())
  63                                 );
  64
  65                                 $relais = q("SELECT `batch`, `id`, `name`,`network` FROM `contact` WHERE `uid` = 0 AND `batch` = '%s' LIMIT 1", dbesc($batch));
  66                                 if ($relais)
  67                                         $relay[] = $relais[0];
  68                         } else
  69                                 $relay[] = $relais[0];
  70                 }
  71
  72                 return $relay;
  73         }
  74
  75         /**
  76          * @brief repairs a signature that was double encoded
  77          *
  78          * The function is unused at the moment. It was copied from the old implementation.
  79          *
  80          * @param string $signature The signature
  81          * @param string $handle The handle of the signature owner
  82          * @param integer $level This value is only set inside this function to avoid endless loops
  83          *
  84          * @return string the repaired signature
  85          */
  86         private function repair_signature($signature, $handle = "", $level = 1) {
  87
  88                 if ($signature == "")
  89                         return ($signature);
  90
  91                 if (base64_encode(base64_decode(base64_decode($signature))) == base64_decode($signature)) {
  92                         $signature = base64_decode($signature);
  93                         logger("Repaired double encoded signature from Diaspora/Hubzilla handle ".$handle." - level ".$level, LOGGER_DEBUG);
  94
  95                         // Do a recursive call to be able to fix even multiple levels
  96                         if ($level < 10)
  97                                 $signature = self::repair_signature($signature, $handle, ++$level);
  98                 }
  99
 100                 return($signature);
 101         }
 102
 103         /**
 104          * @brief: Decodes incoming Diaspora message
 105          *
 106          * @param array $importer Array of the importer user
 107          * @param string $xml urldecoded Diaspora salmon
 108          *
 109          * @return array
 110          * 'message' -> decoded Diaspora XML message
 111          * 'author' -> author diaspora handle
 112          * 'key' -> author public key (converted to pkcs#8)
 113          */
 114         public static function decode($importer, $xml) {
 115
 116                 $public = false;
 117                 $basedom = parse_xml_string($xml);
 118
 119                 if (!is_object($basedom))
 120                         return false;
 121
 122                 $children = $basedom->children('https://joindiaspora.com/protocol');
 123
 124                 if($children->header) {
 125                         $public = true;
 126                         $author_link = str_replace('acct:','',$children->header->author_id);
 127                 } else {
 128
 129                         $encrypted_header = json_decode(base64_decode($children->encrypted_header));
 130
 131                         $encrypted_aes_key_bundle = base64_decode($encrypted_header->aes_key);
 132                         $ciphertext = base64_decode($encrypted_header->ciphertext);
 133
 134                         $outer_key_bundle = '';
 135                         openssl_private_decrypt($encrypted_aes_key_bundle,$outer_key_bundle,$importer['prvkey']);
 136
 137                         $j_outer_key_bundle = json_decode($outer_key_bundle);
 138
 139                         $outer_iv = base64_decode($j_outer_key_bundle->iv);
 140                         $outer_key = base64_decode($j_outer_key_bundle->key);
 141
 142                         $decrypted = mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $outer_key, $ciphertext, MCRYPT_MODE_CBC, $outer_iv);
 143
 144
 145                         $decrypted = pkcs5_unpad($decrypted);
 146
 147                         logger('decrypted: '.$decrypted, LOGGER_DEBUG);
 148                         $idom = parse_xml_string($decrypted,false);
 149
 150                         $inner_iv = base64_decode($idom->iv);
 151                         $inner_aes_key = base64_decode($idom->aes_key);
 152
 153                         $author_link = str_replace('acct:','',$idom->author_id);
 154                 }
 155
 156                 $dom = $basedom->children(NAMESPACE_SALMON_ME);
 157
 158                 // figure out where in the DOM tree our data is hiding
 159
 160                 if($dom->provenance->data)
 161                         $base = $dom->provenance;
 162                 elseif($dom->env->data)
 163                         $base = $dom->env;
 164                 elseif($dom->data)
 165                         $base = $dom;
 166
 167                 if (!$base) {
 168                         logger('unable to locate salmon data in xml');
 169                         http_status_exit(400);
 170                 }
 171
 172
 173                 // Stash the signature away for now. We have to find their key or it won't be good for anything.
 174                 $signature = base64url_decode($base->sig);
 175
 176                 // unpack the  data
 177
 178                 // strip whitespace so our data element will return to one big base64 blob
 179                 $data = str_replace(array(" ","\t","\r","\n"),array("","","",""),$base->data);
 180
 181
 182                 // stash away some other stuff for later
 183
 184                 $type = $base->data[0]->attributes()->type[0];
 185                 $keyhash = $base->sig[0]->attributes()->keyhash[0];
 186                 $encoding = $base->encoding;
 187                 $alg = $base->alg;
 188
 189
 190                 $signed_data = $data.'.'.base64url_encode($type).'.'.base64url_encode($encoding).'.'.base64url_encode($alg);
 191
 192
 193                 // decode the data
 194                 $data = base64url_decode($data);
 195
 196
 197                 if($public)
 198                         $inner_decrypted = $data;
 199                 else {
 200
 201                         // Decode the encrypted blob
 202
 203                         $inner_encrypted = base64_decode($data);
 204                         $inner_decrypted = mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $inner_aes_key, $inner_encrypted, MCRYPT_MODE_CBC, $inner_iv);
 205                         $inner_decrypted = pkcs5_unpad($inner_decrypted);
 206                 }
 207
 208                 if (!$author_link) {
 209                         logger('Could not retrieve author URI.');
 210                         http_status_exit(400);
 211                 }
 212                 // Once we have the author URI, go to the web and try to find their public key
 213                 // (first this will look it up locally if it is in the fcontact cache)
 214                 // This will also convert diaspora public key from pkcs#1 to pkcs#8
 215
 216                 logger('Fetching key for '.$author_link);
 217                 $key = self::key($author_link);
 218
 219                 if (!$key) {
 220                         logger('Could not retrieve author key.');
 221                         http_status_exit(400);
 222                 }
 223
 224                 $verify = rsa_verify($signed_data,$signature,$key);
 225
 226                 if (!$verify) {
 227                         logger('Message did not verify. Discarding.');
 228                         http_status_exit(400);
 229                 }
 230
 231                 logger('Message verified.');
 232
 233                 return array('message' => (string)$inner_decrypted,
 234                                 'author' => unxmlify($author_link),
 235                                 'key' => (string)$key);
 236
 237         }
 238
 239
 240         /**
 241          * @brief Dispatches public messages and find the fitting receivers
 242          *
 243          * @param array $msg The post that will be dispatched
 244          *
 245          * @return int The message id of the generated message, "true" or "false" if there was an error
 246          */
 247         public static function dispatch_public($msg) {
 248
 249                 $enabled = intval(get_config("system", "diaspora_enabled"));
 250                 if (!$enabled) {
 251                         logger("diaspora is disabled");
 252                         return false;
 253                 }
 254
 255                 // Use a dummy importer to import the data for the public copy
 256                 $importer = array("uid" => 0, "page-flags" => PAGE_FREELOVE);
 257                 $message_id = self::dispatch($importer,$msg);
 258
 259                 // Now distribute it to the followers
 260                 $r = q("SELECT `user`.* FROM `user` WHERE `user`.`uid` IN
 261                         (SELECT `contact`.`uid` FROM `contact` WHERE `contact`.`network` = '%s' AND `contact`.`addr` = '%s')
 262                         AND NOT `account_expired` AND NOT `account_removed`",
 263                         dbesc(NETWORK_DIASPORA),
 264                         dbesc($msg["author"])
 265                 );
 266                 if($r) {
 267                         foreach($r as $rr) {
 268                                 logger("delivering to: ".$rr["username"]);
 269                                 self::dispatch($rr,$msg);
 270                         }
 271                 } else
 272                         logger("No subscribers for ".$msg["author"]." ".print_r($msg, true));
 273
 274                 return $message_id;
 275         }
 276
 277         /**
 278          * @brief Dispatches the different message types to the different functions
 279          *
 280          * @param array $importer Array of the importer user
 281          * @param array $msg The post that will be dispatched
 282          *
 283          * @return int The message id of the generated message, "true" or "false" if there was an error
 284          */
 285         public static function dispatch($importer, $msg) {
 286
 287                 // The sender is the handle of the contact that sent the message.
 288                 // This will often be different with relayed messages (for example "like" and "comment")
 289                 $sender = $msg["author"];
 290
 291                 if (!diaspora::valid_posting($msg, $fields)) {
 292                         logger("Invalid posting");
 293                         return false;
 294                 }
 295
 296                 $type = $fields->getName();
 297
 298                 logger("Received message type ".$type." from ".$sender." for user ".$importer["uid"], LOGGER_DEBUG);
 299
 300                 switch ($type) {
 301                         case "account_deletion":
 302                                 return self::receive_account_deletion($importer, $fields);
 303
 304                         case "comment":
 305                                 return self::receive_comment($importer, $sender, $fields, $msg["message"]);
 306
 307                         case "contact":
 308                                 return self::receive_contact_request($importer, $fields);
 309
 310                         case "conversation":
 311                                 return self::receive_conversation($importer, $msg, $fields);
 312
 313                         case "like":
 314                                 return self::receive_like($importer, $sender, $fields);
 315
 316                         case "message":
 317                                 return self::receive_message($importer, $fields);
 318
 319                         case "participation": // Not implemented
 320                                 return self::receive_participation($importer, $fields);
 321
 322                         case "photo": // Not implemented
 323                                 return self::receive_photo($importer, $fields);
 324
 325                         case "poll_participation": // Not implemented
 326                                 return self::receive_poll_participation($importer, $fields);
 327
 328                         case "profile":
 329                                 return self::receive_profile($importer, $fields);
 330
 331                         case "reshare":
 332                                 return self::receive_reshare($importer, $fields, $msg["message"]);
 333
 334                         case "retraction":
 335                                 return self::receive_retraction($importer, $sender, $fields);
 336
 337                         case "status_message":
 338                                 return self::receive_status_message($importer, $fields, $msg["message"]);
 339
 340                         default:
 341                                 logger("Unknown message type ".$type);
 342                                 return false;
 343                 }
 344
 345                 return true;
 346         }
 347
 348         /**
 349          * @brief Checks if a posting is valid and fetches the data fields.
 350          *
 351          * This function does not only check the signature.
 352          * It also does the conversion between the old and the new diaspora format.
 353          *
 354          * @param array $msg Array with the XML, the sender handle and the sender signature
 355          * @param object $fields SimpleXML object that contains the posting when it is valid
 356          *
 357          * @return bool Is the posting valid?
 358          */
 359         private function valid_posting($msg, &$fields) {
 360
 361                 $data = parse_xml_string($msg["message"], false);
 362
 363                 if (!is_object($data)) {
 364                         logger("No valid XML ".$msg["message"], LOGGER_DEBUG);
 365                         return false;
 366                 }
 367
 368                 $first_child = $data->getName();
 369
 370                 // Is this the new or the old version?
 371                 if ($data->getName() == "XML") {
 372                         $oldXML = true;
 373                         foreach ($data->post->children() as $child)
 374                                 $element = $child;
 375                 } else {
 376                         $oldXML = false;
 377                         $element = $data;
 378                 }
 379
 380                 $type = $element->getName();
 381                 $orig_type = $type;
 382
 383                 // All retractions are handled identically from now on.
 384                 // In the new version there will only be "retraction".
 385                 if (in_array($type, array("signed_retraction", "relayable_retraction")))
 386                         $type = "retraction";
 387
 388                 if ($type == "request")
 389                         $type = "contact";
 390
 391                 $fields = new SimpleXMLElement("<".$type."/>");
 392
 393                 $signed_data = "";
 394
 395                 foreach ($element->children() AS $fieldname => $entry) {
 396                         if ($oldXML) {
 397                                 // Translation for the old XML structure
 398                                 if ($fieldname == "diaspora_handle")
 399                                         $fieldname = "author";
 400
 401                                 if ($fieldname == "participant_handles")
 402                                         $fieldname = "participants";
 403
 404                                 if (in_array($type, array("like", "participation"))) {
 405                                         if ($fieldname == "target_type")
 406                                                 $fieldname = "parent_type";
 407                                 }
 408
 409                                 if ($fieldname == "sender_handle")
 410                                         $fieldname = "author";
 411
 412                                 if ($fieldname == "recipient_handle")
 413                                         $fieldname = "recipient";
 414
 415                                 if ($fieldname == "root_diaspora_id")
 416                                         $fieldname = "root_author";
 417
 418                                 if ($type == "retraction") {
 419                                         if ($fieldname == "post_guid")
 420                                                 $fieldname = "target_guid";
 421
 422                                         if ($fieldname == "type")
 423                                                 $fieldname = "target_type";
 424                                 }
 425                         }
 426
 427                         if (($fieldname == "author_signature") AND ($entry != ""))
 428                                 $author_signature = base64_decode($entry);
 429                         elseif (($fieldname == "parent_author_signature") AND ($entry != ""))
 430                                 $parent_author_signature = base64_decode($entry);
 431                         elseif (!in_array($fieldname, array("author_signature", "parent_author_signature", "target_author_signature"))) {
 432                                 if ($signed_data != "") {
 433                                         $signed_data .= ";";
 434                                         $signed_data_parent .= ";";
 435                                 }
 436
 437                                 $signed_data .= $entry;
 438                         }
 439                         if (!in_array($fieldname, array("parent_author_signature", "target_author_signature")) OR
 440                                 ($orig_type == "relayable_retraction"))
 441                                 xml::copy($entry, $fields, $fieldname);
 442                 }
 443
 444                 // This is something that shouldn't happen at all.
 445                 if (in_array($type, array("status_message", "reshare", "profile")))
 446                         if ($msg["author"] != $fields->author) {
 447                                 logger("Message handle is not the same as envelope sender. Quitting this message.");
 448                                 return false;
 449                         }
 450
 451                 // Only some message types have signatures. So we quit here for the other types.
 452                 if (!in_array($type, array("comment", "message", "like")))
 453                         return true;
 454
 455                 // No author_signature? This is a must, so we quit.
 456                 if (!isset($author_signature)) {
 457                         logger("No author signature for type ".$type." - Message: ".$msg["message"], LOGGER_DEBUG);
 458                         return false;
 459                 }
 460
 461                 if (isset($parent_author_signature)) {
 462                         $key = self::key($msg["author"]);
 463
 464                         if (!rsa_verify($signed_data, $parent_author_signature, $key, "sha256")) {
 465                                 logger("No valid parent author signature for author ".$msg["author"]. " in type ".$type." - signed data: ".$signed_data." - Message: ".$msg["message"]." - Signature ".$parent_author_signature, LOGGER_DEBUG);
 466                                 return false;
 467                         }
 468                 }
 469
 470                 $key = self::key($fields->author);
 471
 472                 if (!rsa_verify($signed_data, $author_signature, $key, "sha256")) {
 473                         logger("No valid author signature for author ".$msg["author"]. " in type ".$type." - signed data: ".$signed_data." - Message: ".$msg["message"]." - Signature ".$author_signature, LOGGER_DEBUG);
 474                         return false;
 475                 } else
 476                         return true;
 477         }
 478
 479         /**
 480          * @brief Fetches the public key for a given handle
 481          *
 482          * @param string $handle The handle
 483          *
 484          * @return string The public key
 485          */
 486         private function key($handle) {
 487                 $handle = strval($handle);
 488
 489                 logger("Fetching diaspora key for: ".$handle);
 490
 491                 $r = self::person_by_handle($handle);
 492                 if($r)
 493                         return $r["pubkey"];
 494
 495                 return "";
 496         }
 497
 498         /**
 499          * @brief Fetches data for a given handle
 500          *
 501          * @param string $handle The handle
 502          *
 503          * @return array the queried data
 504          */
 505         private function person_by_handle($handle) {
 506
 507                 $r = q("SELECT * FROM `fcontact` WHERE `network` = '%s' AND `addr` = '%s' LIMIT 1",
 508                         dbesc(NETWORK_DIASPORA),
 509                         dbesc($handle)
 510                 );
 511                 if ($r) {
 512                         $person = $r[0];
 513                         logger("In cache ".print_r($r,true), LOGGER_DEBUG);
 514
 515                         // update record occasionally so it doesn't get stale
 516                         $d = strtotime($person["updated"]." +00:00");
 517                         if ($d < strtotime("now - 14 days"))
 518                                 $update = true;
 519                 }
 520
 521                 if (!$person OR $update) {
 522                         logger("create or refresh", LOGGER_DEBUG);
 523                         $r = probe_url($handle, PROBE_DIASPORA);
 524
 525                         // Note that Friendica contacts will return a "Diaspora person"
 526                         // if Diaspora connectivity is enabled on their server
 527                         if ($r AND ($r["network"] === NETWORK_DIASPORA)) {
 528                                 self::add_fcontact($r, $update);
 529                                 $person = $r;
 530                         }
 531                 }
 532                 return $person;
 533         }
 534
 535         /**
 536          * @brief Updates the fcontact table
 537          *
 538          * @param array $arr The fcontact data
 539          * @param bool $update Update or insert?
 540          *
 541          * @return string The id of the fcontact entry
 542          */
 543         private function add_fcontact($arr, $update = false) {
 544
 545                 if($update) {
 546                         $r = q("UPDATE `fcontact` SET
 547                                         `name` = '%s',
 548                                         `photo` = '%s',
 549                                         `request` = '%s',
 550                                         `nick` = '%s',
 551                                         `addr` = '%s',
 552                                         `batch` = '%s',
 553                                         `notify` = '%s',
 554                                         `poll` = '%s',
 555                                         `confirm` = '%s',
 556                                         `alias` = '%s',
 557                                         `pubkey` = '%s',
 558                                         `updated` = '%s'
 559                                 WHERE `url` = '%s' AND `network` = '%s'",
 560                                         dbesc($arr["name"]),
 561                                         dbesc($arr["photo"]),
 562                                         dbesc($arr["request"]),
 563                                         dbesc($arr["nick"]),
 564                                         dbesc($arr["addr"]),
 565                                         dbesc($arr["batch"]),
 566                                         dbesc($arr["notify"]),
 567                                         dbesc($arr["poll"]),
 568                                         dbesc($arr["confirm"]),
 569                                         dbesc($arr["alias"]),
 570                                         dbesc($arr["pubkey"]),
 571                                         dbesc(datetime_convert()),
 572                                         dbesc($arr["url"]),
 573                                         dbesc($arr["network"])
 574                                 );
 575                 } else {
 576                         $r = q("INSERT INTO `fcontact` (`url`,`name`,`photo`,`request`,`nick`,`addr`,
 577                                         `batch`, `notify`,`poll`,`confirm`,`network`,`alias`,`pubkey`,`updated`)
 578                                 VALUES ('%s','%s','%s','%s','%s','%s','%s','%s','%s','%s','%s','%s','%s','%s')",
 579                                         dbesc($arr["url"]),
 580                                         dbesc($arr["name"]),
 581                                         dbesc($arr["photo"]),
 582                                         dbesc($arr["request"]),
 583                                         dbesc($arr["nick"]),
 584                                         dbesc($arr["addr"]),
 585                                         dbesc($arr["batch"]),
 586                                         dbesc($arr["notify"]),
 587                                         dbesc($arr["poll"]),
 588                                         dbesc($arr["confirm"]),
 589                                         dbesc($arr["network"]),
 590                                         dbesc($arr["alias"]),
 591                                         dbesc($arr["pubkey"]),
 592                                         dbesc(datetime_convert())
 593                                 );
 594                 }
 595
 596                 return $r;
 597         }
 598
 599         /**
 600          * @brief get a handle (user@domain.tld) from a given contact id or gcontact id
 601          *
 602          * @param int $contact_id The id in the contact table
 603          * @param int $gcontact_id The id in the gcontact table
 604          *
 605          * @return string the handle
 606          */
 607         public static function handle_from_contact($contact_id, $gcontact_id = 0) {
 608                 $handle = False;
 609
 610                 logger("contact id is ".$contact_id." - gcontact id is ".$gcontact_id, LOGGER_DEBUG);
 611
 612                 if ($gcontact_id != 0) {
 613                         $r = q("SELECT `addr` FROM `gcontact` WHERE `id` = %d AND `addr` != ''",
 614                                 intval($gcontact_id));
 615                         if ($r)
 616                                 return $r[0]["addr"];
 617                 }
 618
 619                 $r = q("SELECT `network`, `addr`, `self`, `url`, `nick` FROM `contact` WHERE `id` = %d",
 620                         intval($contact_id));
 621                 if ($r) {
 622                         $contact = $r[0];
 623
 624                         logger("contact 'self' = ".$contact['self']." 'url' = ".$contact['url'], LOGGER_DEBUG);
 625
 626                         if($contact['addr'] != "")
 627                                 $handle = $contact['addr'];
 628                         else {
 629                                 $baseurl_start = strpos($contact['url'],'://') + 3;
 630                                 $baseurl_length = strpos($contact['url'],'/profile') - $baseurl_start; // allows installations in a subdirectory--not sure how Diaspora will handle
 631                                 $baseurl = substr($contact['url'], $baseurl_start, $baseurl_length);
 632                                 $handle = $contact['nick'].'@'.$baseurl;
 633                         }
 634                 }
 635
 636                 return $handle;
 637         }
 638
 639         /**
 640          * @brief Get a contact id for a given handle
 641          *
 642          * @param int $uid The user id
 643          * @param string $handle The handle in the format user@domain.tld
 644          *
 645          * @return The contact id
 646          */
 647         private function contact_by_handle($uid, $handle) {
 648                 $r = q("SELECT * FROM `contact` WHERE `uid` = %d AND `addr` = '%s' LIMIT 1",
 649                         intval($uid),
 650                         dbesc($handle)
 651                 );
 652
 653                 if ($r)
 654                         return $r[0];
 655
 656                 $handle_parts = explode("@", $handle);
 657                 $nurl_sql = "%%://".$handle_parts[1]."%%/profile/".$handle_parts[0];
 658                 $r = q("SELECT * FROM `contact` WHERE `network` = '%s' AND `uid` = %d AND `nurl` LIKE '%s' LIMIT 1",
 659                         dbesc(NETWORK_DFRN),
 660                         intval($uid),
 661                         dbesc($nurl_sql)
 662                 );
 663                 if($r)
 664                         return $r[0];
 665
 666                 return false;
 667         }
 668
 669         /**
 670          * @brief Check if posting is allowed for this contact
 671          *
 672          * @param array $importer Array of the importer user
 673          * @param array $contact The contact that is checked
 674          * @param bool $is_comment Is the check for a comment?
 675          *
 676          * @return bool is the contact allowed to post?
 677          */
 678         private function post_allow($importer, $contact, $is_comment = false) {
 679
 680                 // perhaps we were already sharing with this person. Now they're sharing with us.
 681                 // That makes us friends.
 682                 // Normally this should have handled by getting a request - but this could get lost
 683                 if($contact["rel"] == CONTACT_IS_FOLLOWER && in_array($importer["page-flags"], array(PAGE_FREELOVE))) {
 684                         q("UPDATE `contact` SET `rel` = %d, `writable` = 1 WHERE `id` = %d AND `uid` = %d",
 685                                 intval(CONTACT_IS_FRIEND),
 686                                 intval($contact["id"]),
 687                                 intval($importer["uid"])
 688                         );
 689                         $contact["rel"] = CONTACT_IS_FRIEND;
 690                         logger("defining user ".$contact["nick"]." as friend");
 691                 }
 692
 693                 if(($contact["blocked"]) || ($contact["readonly"]) || ($contact["archive"]))
 694                         return false;
 695                 if($contact["rel"] == CONTACT_IS_SHARING || $contact["rel"] == CONTACT_IS_FRIEND)
 696                         return true;
 697                 if($contact["rel"] == CONTACT_IS_FOLLOWER)
 698                         if(($importer["page-flags"] == PAGE_COMMUNITY) OR $is_comment)
 699                                 return true;
 700
 701                 // Messages for the global users are always accepted
 702                 if ($importer["uid"] == 0)
 703                         return true;
 704
 705                 return false;
 706         }
 707
 708         /**
 709          * @brief Fetches the contact id for a handle and checks if posting is allowed
 710          *
 711          * @param array $importer Array of the importer user
 712          * @param string $handle The checked handle in the format user@domain.tld
 713          * @param bool $is_comment Is the check for a comment?
 714          *
 715          * @return array The contact data
 716          */
 717         private function allowed_contact_by_handle($importer, $handle, $is_comment = false) {
 718                 $contact = self::contact_by_handle($importer["uid"], $handle);
 719                 if (!$contact) {
 720                         logger("A Contact for handle ".$handle." and user ".$importer["uid"]." was not found");
 721                         return false;
 722                 }
 723
 724                 if (!self::post_allow($importer, $contact, $is_comment)) {
 725                         logger("The handle: ".$handle." is not allowed to post to user ".$importer["uid"]);
 726                         return false;
 727                 }
 728                 return $contact;
 729         }
 730
 731         /**
 732          * @brief Does the message already exists on the system?
 733          *
 734          * @param int $uid The user id
 735          * @param string $guid The guid of the message
 736          *
 737          * @return int|bool message id if the message already was stored into the system - or false.
 738          */
 739         private function message_exists($uid, $guid) {
 740                 $r = q("SELECT `id` FROM `item` WHERE `uid` = %d AND `guid` = '%s' LIMIT 1",
 741                         intval($uid),
 742                         dbesc($guid)
 743                 );
 744
 745                 if($r) {
 746                         logger("message ".$guid." already exists for user ".$uid);
 747                         return $r[0]["id"];
 748                 }
 749
 750                 return false;
 751         }
 752
 753         /**
 754          * @brief Checks for links to posts in a message
 755          *
 756          * @param array $item The item array
 757          */
 758         private function fetch_guid($item) {
 759                 preg_replace_callback("&\[url=/posts/([^\[\]]*)\](.*)\[\/url\]&Usi",
 760                         function ($match) use ($item){
 761                                 return(self::fetch_guid_sub($match, $item));
 762                         },$item["body"]);
 763         }
 764
 765         /**
 766          * @brief sub function of "fetch_guid" which checks for links in messages
 767          *
 768          * @param array $match array containing a link that has to be checked for a message link
 769          * @param array $item The item array
 770          */
 771         private function fetch_guid_sub($match, $item) {
 772                 if (!self::store_by_guid($match[1], $item["author-link"]))
 773                         self::store_by_guid($match[1], $item["owner-link"]);
 774         }
 775
 776         /**
 777          * @brief Fetches an item with a given guid from a given server
 778          *
 779          * @param string $guid the message guid
 780          * @param string $server The server address
 781          * @param int $uid The user id of the user
 782          *
 783          * @return int the message id of the stored message or false
 784          */
 785         private function store_by_guid($guid, $server, $uid = 0) {
 786                 $serverparts = parse_url($server);
 787                 $server = $serverparts["scheme"]."://".$serverparts["host"];
 788
 789                 logger("Trying to fetch item ".$guid." from ".$server, LOGGER_DEBUG);
 790
 791                 $msg = self::message($guid, $server);
 792
 793                 if (!$msg)
 794                         return false;
 795
 796                 logger("Successfully fetched item ".$guid." from ".$server, LOGGER_DEBUG);
 797
 798                 // Now call the dispatcher
 799                 return self::dispatch_public($msg);
 800         }
 801
 802         /**
 803          * @brief Fetches a message from a server
 804          *
 805          * @param string $guid message guid
 806          * @param string $server The url of the server
 807          * @param int $level Endless loop prevention
 808          *
 809          * @return array
 810          *      'message' => The message XML
 811          *      'author' => The author handle
 812          *      'key' => The public key of the author
 813          */
 814         private function message($guid, $server, $level = 0) {
 815
 816                 if ($level > 5)
 817                         return false;
 818
 819                 // This will work for Diaspora and newer Friendica servers
 820                 $source_url = $server."/p/".$guid.".xml";
 821                 $x = fetch_url($source_url);
 822                 if(!$x)
 823                         return false;
 824
 825                 $source_xml = parse_xml_string($x, false);
 826
 827                 if (!is_object($source_xml))
 828                         return false;
 829
 830                 if ($source_xml->post->reshare) {
 831                         // Reshare of a reshare - old Diaspora version
 832                         return self::message($source_xml->post->reshare->root_guid, $server, ++$level);
 833                 } elseif ($source_xml->getName() == "reshare") {
 834                         // Reshare of a reshare - new Diaspora version
 835                         return self::message($source_xml->root_guid, $server, ++$level);
 836                 }
 837
 838                 $author = "";
 839
 840                 // Fetch the author - for the old and the new Diaspora version
 841                 if ($source_xml->post->status_message->diaspora_handle)
 842                         $author = (string)$source_xml->post->status_message->diaspora_handle;
 843                 elseif ($source_xml->author AND ($source_xml->getName() == "status_message"))
 844                         $author = (string)$source_xml->author;
 845
 846                 // If this isn't a "status_message" then quit
 847                 if (!$author)
 848                         return false;
 849
 850                 $msg = array("message" => $x, "author" => $author);
 851
 852                 $msg["key"] = self::key($msg["author"]);
 853
 854                 return $msg;
 855         }
 856
 857         /**
 858          * @brief Fetches the item record of a given guid
 859          *
 860          * @param int $uid The user id
 861          * @param string $guid message guid
 862          * @param string $author The handle of the item
 863          * @param array $contact The contact of the item owner
 864          *
 865          * @return array the item record
 866          */
 867         private function parent_item($uid, $guid, $author, $contact) {
 868                 $r = q("SELECT `id`, `body`, `wall`, `uri`, `private`, `origin`,
 869                                 `author-name`, `author-link`, `author-avatar`,
 870                                 `owner-name`, `owner-link`, `owner-avatar`
 871                         FROM `item` WHERE `uid` = %d AND `guid` = '%s' LIMIT 1",
 872                         intval($uid), dbesc($guid));
 873
 874                 if(!$r) {
 875                         $result = self::store_by_guid($guid, $contact["url"], $uid);
 876
 877                         if (!$result) {
 878                                 $person = self::person_by_handle($author);
 879                                 $result = self::store_by_guid($guid, $person["url"], $uid);
 880                         }
 881
 882                         if ($result) {
 883                                 logger("Fetched missing item ".$guid." - result: ".$result, LOGGER_DEBUG);
 884
 885                                 $r = q("SELECT `id`, `body`, `wall`, `uri`, `private`, `origin`,
 886                                                 `author-name`, `author-link`, `author-avatar`,
 887                                                 `owner-name`, `owner-link`, `owner-avatar`
 888                                         FROM `item` WHERE `uid` = %d AND `guid` = '%s' LIMIT 1",
 889                                         intval($uid), dbesc($guid));
 890                         }
 891                 }
 892
 893                 if (!$r) {
 894                         logger("parent item not found: parent: ".$guid." - user: ".$uid);
 895                         return false;
 896                 } else {
 897                         logger("parent item found: parent: ".$guid." - user: ".$uid);
 898                         return $r[0];
 899                 }
 900         }
 901
 902         /**
 903          * @brief returns contact details
 904          *
 905          * @param array $contact The default contact if the person isn't found
 906          * @param array $person The record of the person
 907          * @param int $uid The user id
 908          *
 909          * @return array
 910          *      'cid' => contact id
 911          *      'network' => network type
 912          */
 913         private function author_contact_by_url($contact, $person, $uid) {
 914
 915                 $r = q("SELECT `id`, `network` FROM `contact` WHERE `nurl` = '%s' AND `uid` = %d LIMIT 1",
 916                         dbesc(normalise_link($person["url"])), intval($uid));
 917                 if ($r) {
 918                         $cid = $r[0]["id"];
 919                         $network = $r[0]["network"];
 920                 } else {
 921                         $cid = $contact["id"];
 922                         $network = NETWORK_DIASPORA;
 923                 }
 924
 925                 return (array("cid" => $cid, "network" => $network));
 926         }
 927
 928         /**
 929          * @brief Is the profile a hubzilla profile?
 930          *
 931          * @param string $url The profile link
 932          *
 933          * @return bool is it a hubzilla server?
 934          */
 935         public static function is_redmatrix($url) {
 936                 return(strstr($url, "/channel/"));
 937         }
 938
 939         /**
 940          * @brief Generate a post link with a given handle and message guid
 941          *
 942          * @param string $addr The user handle
 943          * @param string $guid message guid
 944          *
 945          * @return string the post link
 946          */
 947         private function plink($addr, $guid) {
 948                 $r = q("SELECT `url`, `nick`, `network` FROM `fcontact` WHERE `addr`='%s' LIMIT 1", dbesc($addr));
 949
 950                 // Fallback
 951                 if (!$r)
 952                         return "https://".substr($addr,strpos($addr,"@")+1)."/posts/".$guid;
 953
 954                 // Friendica contacts are often detected as Diaspora contacts in the "fcontact" table
 955                 // So we try another way as well.
 956                 $s = q("SELECT `network` FROM `gcontact` WHERE `nurl`='%s' LIMIT 1", dbesc(normalise_link($r[0]["url"])));
 957                 if ($s)
 958                         $r[0]["network"] = $s[0]["network"];
 959
 960                 if ($r[0]["network"] == NETWORK_DFRN)
 961                         return(str_replace("/profile/".$r[0]["nick"]."/", "/display/".$guid, $r[0]["url"]."/"));
 962
 963                 if (self::is_redmatrix($r[0]["url"]))
 964                         return $r[0]["url"]."/?f=&mid=".$guid;
 965
 966                 return "https://".substr($addr,strpos($addr,"@")+1)."/posts/".$guid;
 967         }
 968
 969         /**
 970          * @brief Processes an account deletion
 971          *
 972          * @param array $importer Array of the importer user
 973          * @param object $data The message object
 974          *
 975          * @return bool Success
 976          */
 977         private function receive_account_deletion($importer, $data) {
 978
 979                 /// @todo Account deletion should remove the contact from the global contacts as well
 980
 981                 $author = notags(unxmlify($data->author));
 982
 983                 $contact = self::contact_by_handle($importer["uid"], $author);
 984                 if (!$contact) {
 985                         logger("cannot find contact for author: ".$author);
 986                         return false;
 987                 }
 988
 989                 // We now remove the contact
 990                 contact_remove($contact["id"]);
 991                 return true;
 992         }
 993
 994         /**
 995          * @brief Fetch the uri from our database if we already have this item (maybe from ourselves)
 996          *
 997          * @param string $author Author handle
 998          * @param string $guid Message guid
 999          *
1000          * @return string The constructed uri or the one from our database
1001          */
1002         private function get_uri_from_guid($author, $guid) {
1003
1004                 $r = q("SELECT `uri` FROM `item` WHERE `guid` = '%s' LIMIT 1", dbesc($guid));
1005                 if ($r)
1006                         return $r[0]["uri"];
1007                 else
1008                         return $author.":".$guid;
1009         }
1010
1011         /**
1012          * @brief Processes an incoming comment
1013          *
1014          * @param array $importer Array of the importer user
1015          * @param string $sender The sender of the message
1016          * @param object $data The message object
1017          * @param string $xml The original XML of the message
1018          *
1019          * @return int The message id of the generated comment or "false" if there was an error
1020          */
1021         private function receive_comment($importer, $sender, $data, $xml) {
1022                 $guid = notags(unxmlify($data->guid));
1023                 $parent_guid = notags(unxmlify($data->parent_guid));
1024                 $text = unxmlify($data->text);
1025                 $author = notags(unxmlify($data->author));
1026
1027                 $contact = self::allowed_contact_by_handle($importer, $sender, true);
1028                 if (!$contact)
1029                         return false;
1030
1031                 $message_id = self::message_exists($importer["uid"], $guid);
1032                 if ($message_id)
1033                         return $message_id;
1034
1035                 $parent_item = self::parent_item($importer["uid"], $parent_guid, $author, $contact);
1036                 if (!$parent_item)
1037                         return false;
1038
1039                 $person = self::person_by_handle($author);
1040                 if (!is_array($person)) {
1041                         logger("unable to find author details");
1042                         return false;
1043                 }
1044
1045                 // Fetch the contact id - if we know this contact
1046                 $author_contact = self::author_contact_by_url($contact, $person, $importer["uid"]);
1047
1048                 $datarray = array();
1049
1050                 $datarray["uid"] = $importer["uid"];
1051                 $datarray["contact-id"] = $author_contact["cid"];
1052                 $datarray["network"]  = $author_contact["network"];
1053
1054                 $datarray["author-name"] = $person["name"];
1055                 $datarray["author-link"] = $person["url"];
1056                 $datarray["author-avatar"] = ((x($person,"thumb")) ? $person["thumb"] : $person["photo"]);
1057
1058                 $datarray["owner-name"] = $contact["name"];
1059                 $datarray["owner-link"] = $contact["url"];
1060                 $datarray["owner-avatar"] = ((x($contact,"thumb")) ? $contact["thumb"] : $contact["photo"]);
1061
1062                 $datarray["guid"] = $guid;
1063                 $datarray["uri"] = self::get_uri_from_guid($author, $guid);
1064
1065                 $datarray["type"] = "remote-comment";
1066                 $datarray["verb"] = ACTIVITY_POST;
1067                 $datarray["gravity"] = GRAVITY_COMMENT;
1068                 $datarray["parent-uri"] = $parent_item["uri"];
1069
1070                 $datarray["object-type"] = ACTIVITY_OBJ_COMMENT;
1071                 $datarray["object"] = $xml;
1072
1073                 $datarray["body"] = diaspora2bb($text);
1074
1075                 self::fetch_guid($datarray);
1076
1077                 $message_id = item_store($datarray);
1078
1079                 if ($message_id)
1080                         logger("Stored comment ".$datarray["guid"]." with message id ".$message_id, LOGGER_DEBUG);
1081
1082                 // If we are the origin of the parent we store the original data and notify our followers
1083                 if($message_id AND $parent_item["origin"]) {
1084
1085                         // Formerly we stored the signed text, the signature and the author in different fields.
1086                         // We now store the raw data so that we are more flexible.
1087                         q("INSERT INTO `sign` (`iid`,`signed_text`) VALUES (%d,'%s')",
1088                                 intval($message_id),
1089                                 dbesc(json_encode($data))
1090                         );
1091
1092                         // notify others
1093                         proc_run("php", "include/notifier.php", "comment-import", $message_id);
1094                 }
1095
1096                 return $message_id;
1097         }
1098
1099         /**
1100          * @brief processes and stores private messages
1101          *
1102          * @param array $importer Array of the importer user
1103          * @param array $contact The contact of the message
1104          * @param object $data The message object
1105          * @param array $msg Array of the processed message, author handle and key
1106          * @param object $mesg The private message
1107          * @param array $conversation The conversation record to which this message belongs
1108          *
1109          * @return bool "true" if it was successful
1110          */
1111         private function receive_conversation_message($importer, $contact, $data, $msg, $mesg, $conversation) {
1112                 $guid = notags(unxmlify($data->guid));
1113                 $subject = notags(unxmlify($data->subject));
1114                 $author = notags(unxmlify($data->author));
1115
1116                 $reply = 0;
1117
1118                 $msg_guid = notags(unxmlify($mesg->guid));
1119                 $msg_parent_guid = notags(unxmlify($mesg->parent_guid));
1120                 $msg_parent_author_signature = notags(unxmlify($mesg->parent_author_signature));
1121                 $msg_author_signature = notags(unxmlify($mesg->author_signature));
1122                 $msg_text = unxmlify($mesg->text);
1123                 $msg_created_at = datetime_convert("UTC", "UTC", notags(unxmlify($mesg->created_at)));
1124
1125                 // "diaspora_handle" is the element name from the old version
1126                 // "author" is the element name from the new version
1127                 if ($mesg->author)
1128                         $msg_author = notags(unxmlify($mesg->author));
1129                 elseif ($mesg->diaspora_handle)
1130                         $msg_author = notags(unxmlify($mesg->diaspora_handle));
1131                 else
1132                         return false;
1133
1134                 $msg_conversation_guid = notags(unxmlify($mesg->conversation_guid));
1135
1136                 if($msg_conversation_guid != $guid) {
1137                         logger("message conversation guid does not belong to the current conversation.");
1138                         return false;
1139                 }
1140
1141                 $body = diaspora2bb($msg_text);
1142                 $message_uri = $msg_author.":".$msg_guid;
1143
1144                 $author_signed_data = $msg_guid.";".$msg_parent_guid.";".$msg_text.";".unxmlify($mesg->created_at).";".$msg_author.";".$msg_conversation_guid;
1145
1146                 $author_signature = base64_decode($msg_author_signature);
1147
1148                 if(strcasecmp($msg_author,$msg["author"]) == 0) {
1149                         $person = $contact;
1150                         $key = $msg["key"];
1151                 } else {
1152                         $person = self::person_by_handle($msg_author);
1153
1154                         if (is_array($person) && x($person, "pubkey"))
1155                                 $key = $person["pubkey"];
1156                         else {
1157                                 logger("unable to find author details");
1158                                         return false;
1159                         }
1160                 }
1161
1162                 if (!rsa_verify($author_signed_data, $author_signature, $key, "sha256")) {
1163                         logger("verification failed.");
1164                         return false;
1165                 }
1166
1167                 if($msg_parent_author_signature) {
1168                         $owner_signed_data = $msg_guid.";".$msg_parent_guid.";".$msg_text.";".unxmlify($mesg->created_at).";".$msg_author.";".$msg_conversation_guid;
1169
1170                         $parent_author_signature = base64_decode($msg_parent_author_signature);
1171
1172                         $key = $msg["key"];
1173
1174                         if (!rsa_verify($owner_signed_data, $parent_author_signature, $key, "sha256")) {
1175                                 logger("owner verification failed.");
1176                                 return false;
1177                         }
1178                 }
1179
1180                 $r = q("SELECT `id` FROM `mail` WHERE `uri` = '%s' LIMIT 1",
1181                         dbesc($message_uri)
1182                 );
1183                 if($r) {
1184                         logger("duplicate message already delivered.", LOGGER_DEBUG);
1185                         return false;
1186                 }
1187
1188                 q("INSERT INTO `mail` (`uid`, `guid`, `convid`, `from-name`,`from-photo`,`from-url`,`contact-id`,`title`,`body`,`seen`,`reply`,`uri`,`parent-uri`,`created`)
1189                         VALUES (%d, '%s', %d, '%s', '%s', '%s', %d, '%s', '%s', %d, %d, '%s','%s','%s')",
1190                         intval($importer["uid"]),
1191                         dbesc($msg_guid),
1192                         intval($conversation["id"]),
1193                         dbesc($person["name"]),
1194                         dbesc($person["photo"]),
1195                         dbesc($person["url"]),
1196                         intval($contact["id"]),
1197                         dbesc($subject),
1198                         dbesc($body),
1199                         0,
1200                         0,
1201                         dbesc($message_uri),
1202                         dbesc($author.":".$guid),
1203                         dbesc($msg_created_at)
1204                 );
1205
1206                 q("UPDATE `conv` SET `updated` = '%s' WHERE `id` = %d",
1207                         dbesc(datetime_convert()),
1208                         intval($conversation["id"])
1209                 );
1210
1211                 notification(array(
1212                         "type" => NOTIFY_MAIL,
1213                         "notify_flags" => $importer["notify-flags"],
1214                         "language" => $importer["language"],
1215                         "to_name" => $importer["username"],
1216                         "to_email" => $importer["email"],
1217                         "uid" =>$importer["uid"],
1218                         "item" => array("subject" => $subject, "body" => $body),
1219                         "source_name" => $person["name"],
1220                         "source_link" => $person["url"],
1221                         "source_photo" => $person["thumb"],
1222                         "verb" => ACTIVITY_POST,
1223                         "otype" => "mail"
1224                 ));
1225                 return true;
1226         }
1227
1228         /**
1229          * @brief Processes new private messages (answers to private messages are processed elsewhere)
1230          *
1231          * @param array $importer Array of the importer user
1232          * @param array $msg Array of the processed message, author handle and key
1233          * @param object $data The message object
1234          *
1235          * @return bool Success
1236          */
1237         private function receive_conversation($importer, $msg, $data) {
1238                 $guid = notags(unxmlify($data->guid));
1239                 $subject = notags(unxmlify($data->subject));
1240                 $created_at = datetime_convert("UTC", "UTC", notags(unxmlify($data->created_at)));
1241                 $author = notags(unxmlify($data->author));
1242                 $participants = notags(unxmlify($data->participants));
1243
1244                 $messages = $data->message;
1245
1246                 if (!count($messages)) {
1247                         logger("empty conversation");
1248                         return false;
1249                 }
1250
1251                 $contact = self::allowed_contact_by_handle($importer, $msg["author"], true);
1252                 if (!$contact)
1253                         return false;
1254
1255                 $conversation = null;
1256
1257                 $c = q("SELECT * FROM `conv` WHERE `uid` = %d AND `guid` = '%s' LIMIT 1",
1258                         intval($importer["uid"]),
1259                         dbesc($guid)
1260                 );
1261                 if($c)
1262                         $conversation = $c[0];
1263                 else {
1264                         $r = q("INSERT INTO `conv` (`uid`, `guid`, `creator`, `created`, `updated`, `subject`, `recips`)
1265                                 VALUES (%d, '%s', '%s', '%s', '%s', '%s', '%s')",
1266                                 intval($importer["uid"]),
1267                                 dbesc($guid),
1268                                 dbesc($author),
1269                                 dbesc(datetime_convert("UTC", "UTC", $created_at)),
1270                                 dbesc(datetime_convert()),
1271                                 dbesc($subject),
1272                                 dbesc($participants)
1273                         );
1274                         if($r)
1275                                 $c = q("SELECT * FROM `conv` WHERE `uid` = %d AND `guid` = '%s' LIMIT 1",
1276                                         intval($importer["uid"]),
1277                                         dbesc($guid)
1278                                 );
1279
1280                         if($c)
1281                                 $conversation = $c[0];
1282                 }
1283                 if (!$conversation) {
1284                         logger("unable to create conversation.");
1285                         return;
1286                 }
1287
1288                 foreach($messages as $mesg)
1289                         self::receive_conversation_message($importer, $contact, $data, $msg, $mesg, $conversation);
1290
1291                 return true;
1292         }
1293
1294         /**
1295          * @brief Creates the body for a "like" message
1296          *
1297          * @param array $contact The contact that send us the "like"
1298          * @param array $parent_item The item array of the parent item
1299          * @param string $guid message guid
1300          *
1301          * @return string the body
1302          */
1303         private function construct_like_body($contact, $parent_item, $guid) {
1304                 $bodyverb = t('%1$s likes %2$s\'s %3$s');
1305
1306                 $ulink = "[url=".$contact["url"]."]".$contact["name"]."[/url]";
1307                 $alink = "[url=".$parent_item["author-link"]."]".$parent_item["author-name"]."[/url]";
1308                 $plink = "[url=".App::get_baseurl()."/display/".urlencode($guid)."]".t("status")."[/url]";
1309
1310                 return sprintf($bodyverb, $ulink, $alink, $plink);
1311         }
1312
1313         /**
1314          * @brief Creates a XML object for a "like"
1315          *
1316          * @param array $importer Array of the importer user
1317          * @param array $parent_item The item array of the parent item
1318          *
1319          * @return string The XML
1320          */
1321         private function construct_like_object($importer, $parent_item) {
1322                 $objtype = ACTIVITY_OBJ_NOTE;
1323                 $link = '<link rel="alternate" type="text/html" href="'.App::get_baseurl()."/display/".$importer["nickname"]."/".$parent_item["id"].'" />';
1324                 $parent_body = $parent_item["body"];
1325
1326                 $xmldata = array("object" => array("type" => $objtype,
1327                                                 "local" => "1",
1328                                                 "id" => $parent_item["uri"],
1329                                                 "link" => $link,
1330                                                 "title" => "",
1331                                                 "content" => $parent_body));
1332
1333                 return xml::from_array($xmldata, $xml, true);
1334         }
1335
1336         /**
1337          * @brief Processes "like" messages
1338          *
1339          * @param array $importer Array of the importer user
1340          * @param string $sender The sender of the message
1341          * @param object $data The message object
1342          *
1343          * @return int The message id of the generated like or "false" if there was an error
1344          */
1345         private function receive_like($importer, $sender, $data) {
1346                 $positive = notags(unxmlify($data->positive));
1347                 $guid = notags(unxmlify($data->guid));
1348                 $parent_type = notags(unxmlify($data->parent_type));
1349                 $parent_guid = notags(unxmlify($data->parent_guid));
1350                 $author = notags(unxmlify($data->author));
1351
1352                 // likes on comments aren't supported by Diaspora - only on posts
1353                 // But maybe this will be supported in the future, so we will accept it.
1354                 if (!in_array($parent_type, array("Post", "Comment")))
1355                         return false;
1356
1357                 $contact = self::allowed_contact_by_handle($importer, $sender, true);
1358                 if (!$contact)
1359                         return false;
1360
1361                 $message_id = self::message_exists($importer["uid"], $guid);
1362                 if ($message_id)
1363                         return $message_id;
1364
1365                 $parent_item = self::parent_item($importer["uid"], $parent_guid, $author, $contact);
1366                 if (!$parent_item)
1367                         return false;
1368
1369                 $person = self::person_by_handle($author);
1370                 if (!is_array($person)) {
1371                         logger("unable to find author details");
1372                         return false;
1373                 }
1374
1375                 // Fetch the contact id - if we know this contact
1376                 $author_contact = self::author_contact_by_url($contact, $person, $importer["uid"]);
1377
1378                 // "positive" = "false" would be a Dislike - wich isn't currently supported by Diaspora
1379                 // We would accept this anyhow.
1380                 if ($positive == "true")
1381                         $verb = ACTIVITY_LIKE;
1382                 else
1383                         $verb = ACTIVITY_DISLIKE;
1384
1385                 $datarray = array();
1386
1387                 $datarray["uid"] = $importer["uid"];
1388                 $datarray["contact-id"] = $author_contact["cid"];
1389                 $datarray["network"]  = $author_contact["network"];
1390
1391                 $datarray["author-name"] = $person["name"];
1392                 $datarray["author-link"] = $person["url"];
1393                 $datarray["author-avatar"] = ((x($person,"thumb")) ? $person["thumb"] : $person["photo"]);
1394
1395                 $datarray["owner-name"] = $contact["name"];
1396                 $datarray["owner-link"] = $contact["url"];
1397                 $datarray["owner-avatar"] = ((x($contact,"thumb")) ? $contact["thumb"] : $contact["photo"]);
1398
1399                 $datarray["guid"] = $guid;
1400                 $datarray["uri"] = self::get_uri_from_guid($author, $guid);
1401
1402                 $datarray["type"] = "activity";
1403                 $datarray["verb"] = $verb;
1404                 $datarray["gravity"] = GRAVITY_LIKE;
1405                 $datarray["parent-uri"] = $parent_item["uri"];
1406
1407                 $datarray["object-type"] = ACTIVITY_OBJ_NOTE;
1408                 $datarray["object"] = self::construct_like_object($importer, $parent_item);
1409
1410                 $datarray["body"] = self::construct_like_body($contact, $parent_item, $guid);
1411
1412                 $message_id = item_store($datarray);
1413
1414                 if ($message_id)
1415                         logger("Stored like ".$datarray["guid"]." with message id ".$message_id, LOGGER_DEBUG);
1416
1417                 // If we are the origin of the parent we store the original data and notify our followers
1418                 if($message_id AND $parent_item["origin"]) {
1419
1420                         // Formerly we stored the signed text, the signature and the author in different fields.
1421                         // We now store the raw data so that we are more flexible.
1422                         q("INSERT INTO `sign` (`iid`,`signed_text`) VALUES (%d,'%s')",
1423                                 intval($message_id),
1424                                 dbesc(json_encode($data))
1425                         );
1426
1427                         // notify others
1428                         proc_run("php", "include/notifier.php", "comment-import", $message_id);
1429                 }
1430
1431                 return $message_id;
1432         }
1433
1434         /**
1435          * @brief Processes private messages
1436          *
1437          * @param array $importer Array of the importer user
1438          * @param object $data The message object
1439          *
1440          * @return bool Success?
1441          */
1442         private function receive_message($importer, $data) {
1443                 $guid = notags(unxmlify($data->guid));
1444                 $parent_guid = notags(unxmlify($data->parent_guid));
1445                 $text = unxmlify($data->text);
1446                 $created_at = datetime_convert("UTC", "UTC", notags(unxmlify($data->created_at)));
1447                 $author = notags(unxmlify($data->author));
1448                 $conversation_guid = notags(unxmlify($data->conversation_guid));
1449
1450                 $contact = self::allowed_contact_by_handle($importer, $author, true);
1451                 if (!$contact)
1452                         return false;
1453
1454                 $conversation = null;
1455
1456                 $c = q("SELECT * FROM `conv` WHERE `uid` = %d AND `guid` = '%s' LIMIT 1",
1457                         intval($importer["uid"]),
1458                         dbesc($conversation_guid)
1459                 );
1460                 if($c)
1461                         $conversation = $c[0];
1462                 else {
1463                         logger("conversation not available.");
1464                         return false;
1465                 }
1466
1467                 $reply = 0;
1468
1469                 $body = diaspora2bb($text);
1470                 $message_uri = $author.":".$guid;
1471
1472                 $person = self::person_by_handle($author);
1473                 if (!$person) {
1474                         logger("unable to find author details");
1475                         return false;
1476                 }
1477
1478                 $r = q("SELECT `id` FROM `mail` WHERE `uri` = '%s' AND `uid` = %d LIMIT 1",
1479                         dbesc($message_uri),
1480                         intval($importer["uid"])
1481                 );
1482                 if($r) {
1483                         logger("duplicate message already delivered.", LOGGER_DEBUG);
1484                         return false;
1485                 }
1486
1487                 q("INSERT INTO `mail` (`uid`, `guid`, `convid`, `from-name`,`from-photo`,`from-url`,`contact-id`,`title`,`body`,`seen`,`reply`,`uri`,`parent-uri`,`created`)
1488                                 VALUES ( %d, '%s', %d, '%s', '%s', '%s', %d, '%s', '%s', %d, %d, '%s','%s','%s')",
1489                         intval($importer["uid"]),
1490                         dbesc($guid),
1491                         intval($conversation["id"]),
1492                         dbesc($person["name"]),
1493                         dbesc($person["photo"]),
1494                         dbesc($person["url"]),
1495                         intval($contact["id"]),
1496                         dbesc($conversation["subject"]),
1497                         dbesc($body),
1498                         0,
1499                         1,
1500                         dbesc($message_uri),
1501                         dbesc($author.":".$parent_guid),
1502                         dbesc($created_at)
1503                 );
1504
1505                 q("UPDATE `conv` SET `updated` = '%s' WHERE `id` = %d",
1506                         dbesc(datetime_convert()),
1507                         intval($conversation["id"])
1508                 );
1509
1510                 return true;
1511         }
1512
1513         /**
1514          * @brief Processes participations - unsupported by now
1515          *
1516          * @param array $importer Array of the importer user
1517          * @param object $data The message object
1518          *
1519          * @return bool always true
1520          */
1521         private function receive_participation($importer, $data) {
1522                 // I'm not sure if we can fully support this message type
1523                 return true;
1524         }
1525
1526         /**
1527          * @brief Processes photos - unneeded
1528          *
1529          * @param array $importer Array of the importer user
1530          * @param object $data The message object
1531          *
1532          * @return bool always true
1533          */
1534         private function receive_photo($importer, $data) {
1535                 // There doesn't seem to be a reason for this function, since the photo data is transmitted in the status message as well
1536                 return true;
1537         }
1538
1539         /**
1540          * @brief Processes poll participations - unssupported
1541          *
1542          * @param array $importer Array of the importer user
1543          * @param object $data The message object
1544          *
1545          * @return bool always true
1546          */
1547         private function receive_poll_participation($importer, $data) {
1548                 // We don't support polls by now
1549                 return true;
1550         }
1551
1552         /**
1553          * @brief Processes incoming profile updates
1554          *
1555          * @param array $importer Array of the importer user
1556          * @param object $data The message object
1557          *
1558          * @return bool Success
1559          */
1560         private function receive_profile($importer, $data) {
1561                 $author = notags(unxmlify($data->author));
1562
1563                 $contact = self::contact_by_handle($importer["uid"], $author);
1564                 if (!$contact)
1565                         return false;
1566
1567                 $name = unxmlify($data->first_name).((strlen($data->last_name)) ? " ".unxmlify($data->last_name) : "");
1568                 $image_url = unxmlify($data->image_url);
1569                 $birthday = unxmlify($data->birthday);
1570                 $location = diaspora2bb(unxmlify($data->location));
1571                 $about = diaspora2bb(unxmlify($data->bio));
1572                 $gender = unxmlify($data->gender);
1573                 $searchable = (unxmlify($data->searchable) == "true");
1574                 $nsfw = (unxmlify($data->nsfw) == "true");
1575                 $tags = unxmlify($data->tag_string);
1576
1577                 $tags = explode("#", $tags);
1578
1579                 $keywords = array();
1580                 foreach ($tags as $tag) {
1581                         $tag = trim(strtolower($tag));
1582                         if ($tag != "")
1583                                 $keywords[] = $tag;
1584                 }
1585
1586                 $keywords = implode(", ", $keywords);
1587
1588                 $handle_parts = explode("@", $author);
1589                 $nick = $handle_parts[0];
1590
1591                 if($name === "")
1592                         $name = $handle_parts[0];
1593
1594                 if( preg_match("|^https?://|", $image_url) === 0)
1595                         $image_url = "http://".$handle_parts[1].$image_url;
1596
1597                 update_contact_avatar($image_url, $importer["uid"], $contact["id"]);
1598
1599                 // Generic birthday. We don't know the timezone. The year is irrelevant.
1600
1601                 $birthday = str_replace("1000", "1901", $birthday);
1602
1603                 if ($birthday != "")
1604                         $birthday = datetime_convert("UTC", "UTC", $birthday, "Y-m-d");
1605
1606                 // this is to prevent multiple birthday notifications in a single year
1607                 // if we already have a stored birthday and the 'm-d' part hasn't changed, preserve the entry, which will preserve the notify year
1608
1609                 if(substr($birthday,5) === substr($contact["bd"],5))
1610                         $birthday = $contact["bd"];
1611
1612                 $r = q("UPDATE `contact` SET `name` = '%s', `nick` = '%s', `addr` = '%s', `name-date` = '%s', `bd` = '%s',
1613                                 `location` = '%s', `about` = '%s', `keywords` = '%s', `gender` = '%s' WHERE `id` = %d AND `uid` = %d",
1614                         dbesc($name),
1615                         dbesc($nick),
1616                         dbesc($author),
1617                         dbesc(datetime_convert()),
1618                         dbesc($birthday),
1619                         dbesc($location),
1620                         dbesc($about),
1621                         dbesc($keywords),
1622                         dbesc($gender),
1623                         intval($contact["id"]),
1624                         intval($importer["uid"])
1625                 );
1626
1627                 if ($searchable) {
1628                         poco_check($contact["url"], $name, NETWORK_DIASPORA, $image_url, $about, $location, $gender, $keywords, "",
1629                                 datetime_convert(), 2, $contact["id"], $importer["uid"]);
1630                 }
1631
1632                 $gcontact = array("url" => $contact["url"], "network" => NETWORK_DIASPORA, "generation" => 2,
1633                                         "photo" => $image_url, "name" => $name, "location" => $location,
1634                                         "about" => $about, "birthday" => $birthday, "gender" => $gender,
1635                                         "addr" => $author, "nick" => $nick, "keywords" => $keywords,
1636                                         "hide" => !$searchable, "nsfw" => $nsfw);
1637
1638                 update_gcontact($gcontact);
1639
1640                 logger("Profile of contact ".$contact["id"]." stored for user ".$importer["uid"], LOGGER_DEBUG);
1641
1642                 return true;
1643         }
1644
1645         /**
1646          * @brief Processes incoming friend requests
1647          *
1648          * @param array $importer Array of the importer user
1649          * @param array $contact The contact that send the request
1650          */
1651         private function receive_request_make_friend($importer, $contact) {
1652
1653                 $a = get_app();
1654
1655                 if($contact["rel"] == CONTACT_IS_FOLLOWER && in_array($importer["page-flags"], array(PAGE_FREELOVE))) {
1656                         q("UPDATE `contact` SET `rel` = %d, `writable` = 1 WHERE `id` = %d AND `uid` = %d",
1657                                 intval(CONTACT_IS_FRIEND),
1658                                 intval($contact["id"]),
1659                                 intval($importer["uid"])
1660                         );
1661                 }
1662                 // send notification
1663
1664                 $r = q("SELECT `hide-friends` FROM `profile` WHERE `uid` = %d AND `is-default` = 1 LIMIT 1",
1665                         intval($importer["uid"])
1666                 );
1667
1668                 if($r && !$r[0]["hide-friends"] && !$contact["hidden"] && intval(get_pconfig($importer["uid"], "system", "post_newfriend"))) {
1669
1670                         $self = q("SELECT * FROM `contact` WHERE `self` AND `uid` = %d LIMIT 1",
1671                                 intval($importer["uid"])
1672                         );
1673
1674                         // they are not CONTACT_IS_FOLLOWER anymore but that's what we have in the array
1675
1676                         if($self && $contact["rel"] == CONTACT_IS_FOLLOWER) {
1677
1678                                 $arr = array();
1679                                 $arr["uri"] = $arr["parent-uri"] = item_new_uri($a->get_hostname(), $importer["uid"]);
1680                                 $arr["uid"] = $importer["uid"];
1681                                 $arr["contact-id"] = $self[0]["id"];
1682                                 $arr["wall"] = 1;
1683                                 $arr["type"] = 'wall';
1684                                 $arr["gravity"] = 0;
1685                                 $arr["origin"] = 1;
1686                                 $arr["author-name"] = $arr["owner-name"] = $self[0]["name"];
1687                                 $arr["author-link"] = $arr["owner-link"] = $self[0]["url"];
1688                                 $arr["author-avatar"] = $arr["owner-avatar"] = $self[0]["thumb"];
1689                                 $arr["verb"] = ACTIVITY_FRIEND;
1690                                 $arr["object-type"] = ACTIVITY_OBJ_PERSON;
1691
1692                                 $A = "[url=".$self[0]["url"]."]".$self[0]["name"]."[/url]";
1693                                 $B = "[url=".$contact["url"]."]".$contact["name"]."[/url]";
1694                                 $BPhoto = "[url=".$contact["url"]."][img]".$contact["thumb"]."[/img][/url]";
1695                                 $arr["body"] = sprintf(t("%1$s is now friends with %2$s"), $A, $B)."\n\n\n".$Bphoto;
1696
1697                                 $arr["object"] = self::construct_new_friend_object($contact);
1698
1699                                 $arr["last-child"] = 1;
1700
1701                                 $arr["allow_cid"] = $user[0]["allow_cid"];
1702                                 $arr["allow_gid"] = $user[0]["allow_gid"];
1703                                 $arr["deny_cid"]  = $user[0]["deny_cid"];
1704                                 $arr["deny_gid"]  = $user[0]["deny_gid"];
1705
1706                                 $i = item_store($arr);
1707                                 if($i)
1708                                         proc_run("php", "include/notifier.php", "activity", $i);
1709                         }
1710                 }
1711         }
1712
1713         /**
1714          * @brief Creates a XML object for a "new friend" message
1715          *
1716          * @param array $contact Array of the contact
1717          *
1718          * @return string The XML
1719          */
1720         private function construct_new_friend_object($contact) {
1721                 $objtype = ACTIVITY_OBJ_PERSON;
1722                 $link = '<link rel="alternate" type="text/html" href="'.$contact["url"].'" />'."\n".
1723                         '<link rel="photo" type="image/jpeg" href="'.$contact["thumb"].'" />'."\n";
1724
1725                 $xmldata = array("object" => array("type" => $objtype,
1726                                                 "title" => $contact["name"],
1727                                                 "id" => $contact["url"]."/".$contact["name"],
1728                                                 "link" => $link));
1729
1730                 return xml::from_array($xmldata, $xml, true);
1731         }
1732
1733         /**
1734          * @brief Processes incoming sharing notification
1735          *
1736          * @param array $importer Array of the importer user
1737          * @param object $data The message object
1738          *
1739          * @return bool Success
1740          */
1741         private function receive_contact_request($importer, $data) {
1742                 $author = unxmlify($data->author);
1743                 $recipient = unxmlify($data->recipient);
1744
1745                 if (!$author || !$recipient)
1746                         return false;
1747
1748                 // the current protocol version doesn't know these fields
1749                 // That means that we will assume their existance
1750                 if (isset($data->following))
1751                         $following = (unxmlify($data->following) == "true");
1752                 else
1753                         $following = true;
1754
1755                 if (isset($data->sharing))
1756                         $sharing = (unxmlify($data->sharing) == "true");
1757                 else
1758                         $sharing = true;
1759
1760                 $contact = self::contact_by_handle($importer["uid"],$author);
1761
1762                 // perhaps we were already sharing with this person. Now they're sharing with us.
1763                 // That makes us friends.
1764                 if ($contact) {
1765                         if ($following AND $sharing) {
1766                                 self::receive_request_make_friend($importer, $contact);
1767                                 return true;
1768                         } else /// @todo Handle all possible variations of adding and retracting of permissions
1769                                 return false;
1770                 }
1771
1772                 if (!$following AND $sharing AND in_array($importer["page-flags"], array(PAGE_SOAPBOX, PAGE_NORMAL))) {
1773                         logger("Author ".$author." wants to share with us - but doesn't want to listen. Request is ignored.", LOGGER_DEBUG);
1774                         return false;
1775                 } elseif (!$following AND !$sharing) {
1776                         logger("Author ".$author." doesn't want anything - and we don't know the author. Request is ignored.", LOGGER_DEBUG);
1777                         return false;
1778                 }
1779
1780                 $ret = self::person_by_handle($author);
1781
1782                 if (!$ret || ($ret["network"] != NETWORK_DIASPORA)) {
1783                         logger("Cannot resolve diaspora handle ".$author." for ".$recipient);
1784                         return false;
1785                 }
1786
1787                 $batch = (($ret["batch"]) ? $ret["batch"] : implode("/", array_slice(explode("/", $ret["url"]), 0, 3))."/receive/public");
1788
1789                 $r = q("INSERT INTO `contact` (`uid`, `network`,`addr`,`created`,`url`,`nurl`,`batch`,`name`,`nick`,`photo`,`pubkey`,`notify`,`poll`,`blocked`,`priority`)
1790                         VALUES (%d, '%s', '%s', '%s', '%s','%s','%s','%s','%s','%s','%s','%s','%s',%d,%d)",
1791                         intval($importer["uid"]),
1792                         dbesc($ret["network"]),
1793                         dbesc($ret["addr"]),
1794                         datetime_convert(),
1795                         dbesc($ret["url"]),
1796                         dbesc(normalise_link($ret["url"])),
1797                         dbesc($batch),
1798                         dbesc($ret["name"]),
1799                         dbesc($ret["nick"]),
1800                         dbesc($ret["photo"]),
1801                         dbesc($ret["pubkey"]),
1802                         dbesc($ret["notify"]),
1803                         dbesc($ret["poll"]),
1804                         1,
1805                         2
1806                 );
1807
1808                 // find the contact record we just created
1809
1810                 $contact_record = self::contact_by_handle($importer["uid"],$author);
1811
1812                 if (!$contact_record) {
1813                         logger("unable to locate newly created contact record.");
1814                         return;
1815                 }
1816
1817                 $def_gid = get_default_group($importer['uid'], $ret["network"]);
1818
1819                 if(intval($def_gid))
1820                         group_add_member($importer["uid"], "", $contact_record["id"], $def_gid);
1821
1822                 update_contact_avatar($ret["photo"], $importer['uid'], $contact_record["id"], true);
1823
1824                 if($importer["page-flags"] == PAGE_NORMAL) {
1825
1826                         $hash = random_string().(string)time();   // Generate a confirm_key
1827
1828                         $ret = q("INSERT INTO `intro` (`uid`, `contact-id`, `blocked`, `knowyou`, `note`, `hash`, `datetime`)
1829                                 VALUES (%d, %d, %d, %d, '%s', '%s', '%s')",
1830                                 intval($importer["uid"]),
1831                                 intval($contact_record["id"]),
1832                                 0,
1833                                 0,
1834                                 dbesc(t("Sharing notification from Diaspora network")),
1835                                 dbesc($hash),
1836                                 dbesc(datetime_convert())
1837                         );
1838                 } else {
1839
1840                         // automatic friend approval
1841
1842                         update_contact_avatar($contact_record["photo"],$importer["uid"],$contact_record["id"]);
1843
1844                         // technically they are sharing with us (CONTACT_IS_SHARING),
1845                         // but if our page-type is PAGE_COMMUNITY or PAGE_SOAPBOX
1846                         // we are going to change the relationship and make them a follower.
1847
1848                         if (($importer["page-flags"] == PAGE_FREELOVE) AND $sharing AND $following)
1849                                 $new_relation = CONTACT_IS_FRIEND;
1850                         elseif (($importer["page-flags"] == PAGE_FREELOVE) AND $sharing)
1851                                 $new_relation = CONTACT_IS_SHARING;
1852                         else
1853                                 $new_relation = CONTACT_IS_FOLLOWER;
1854
1855                         $r = q("UPDATE `contact` SET `rel` = %d,
1856                                 `name-date` = '%s',
1857                                 `uri-date` = '%s',
1858                                 `blocked` = 0,
1859                                 `pending` = 0,
1860                                 `writable` = 1
1861                                 WHERE `id` = %d
1862                                 ",
1863                                 intval($new_relation),
1864                                 dbesc(datetime_convert()),
1865                                 dbesc(datetime_convert()),
1866                                 intval($contact_record["id"])
1867                         );
1868
1869                         $u = q("SELECT * FROM `user` WHERE `uid` = %d LIMIT 1", intval($importer["uid"]));
1870                         if($u)
1871                                 $ret = self::send_share($u[0], $contact_record);
1872                 }
1873
1874                 return true;
1875         }
1876
1877         /**
1878          * @brief Fetches a message with a given guid
1879          *
1880          * @param string $guid message guid
1881          * @param string $orig_author handle of the original post
1882          * @param string $author handle of the sharer
1883          *
1884          * @return array The fetched item
1885          */
1886         private function original_item($guid, $orig_author, $author) {
1887
1888                 // Do we already have this item?
1889                 $r = q("SELECT `body`, `tag`, `app`, `created`, `object-type`, `uri`, `guid`,
1890                                 `author-name`, `author-link`, `author-avatar`
1891                                 FROM `item` WHERE `guid` = '%s' AND `visible` AND NOT `deleted` AND `body` != '' LIMIT 1",
1892                         dbesc($guid));
1893
1894                 if($r) {
1895                         logger("reshared message ".$guid." already exists on system.");
1896
1897                         // Maybe it is already a reshared item?
1898                         // Then refetch the content, if it is a reshare from a reshare.
1899                         // If it is a reshared post from another network then reformat to avoid display problems with two share elements
1900                         if (self::is_reshare($r[0]["body"], true))
1901                                 $r = array();
1902                         elseif (self::is_reshare($r[0]["body"], false)) {
1903                                 $r[0]["body"] = diaspora2bb(bb2diaspora($r[0]["body"]));
1904
1905                                 // Add OEmbed and other information to the body
1906                                 $r[0]["body"] = add_page_info_to_body($r[0]["body"], false, true);
1907
1908                                 return $r[0];
1909                         } else
1910                                 return $r[0];
1911                 }
1912
1913                 if (!$r) {
1914                         $server = "https://".substr($orig_author, strpos($orig_author, "@") + 1);
1915                         logger("1st try: reshared message ".$guid." will be fetched from original server: ".$server);
1916                         $item_id = self::store_by_guid($guid, $server);
1917
1918                         if (!$item_id) {
1919                                 $server = "http://".substr($orig_author, strpos($orig_author, "@") + 1);
1920                                 logger("2nd try: reshared message ".$guid." will be fetched from original server: ".$server);
1921                                 $item_id = self::store_by_guid($guid, $server);
1922                         }
1923
1924                         // Deactivated by now since there is a risk that someone could manipulate postings through this method
1925 /*                      if (!$item_id) {
1926                                 $server = "https://".substr($author, strpos($author, "@") + 1);
1927                                 logger("3rd try: reshared message ".$guid." will be fetched from sharer's server: ".$server);
1928                                 $item_id = self::store_by_guid($guid, $server);
1929                         }
1930                         if (!$item_id) {
1931                                 $server = "http://".substr($author, strpos($author, "@") + 1);
1932                                 logger("4th try: reshared message ".$guid." will be fetched from sharer's server: ".$server);
1933                                 $item_id = self::store_by_guid($guid, $server);
1934                         }
1935 */
1936                         if ($item_id) {
1937                                 $r = q("SELECT `body`, `tag`, `app`, `created`, `object-type`, `uri`, `guid`,
1938                                                 `author-name`, `author-link`, `author-avatar`
1939                                         FROM `item` WHERE `id` = %d AND `visible` AND NOT `deleted` AND `body` != '' LIMIT 1",
1940                                         intval($item_id));
1941
1942                                 if ($r) {
1943                                         // If it is a reshared post from another network then reformat to avoid display problems with two share elements
1944                                         if (self::is_reshare($r[0]["body"], false))
1945                                                 $r[0]["body"] = diaspora2bb(bb2diaspora($r[0]["body"]));
1946
1947                                         return $r[0];
1948                                 }
1949
1950                         }
1951                 }
1952                 return false;
1953         }
1954
1955         /**
1956          * @brief Processes a reshare message
1957          *
1958          * @param array $importer Array of the importer user
1959          * @param object $data The message object
1960          * @param string $xml The original XML of the message
1961          *
1962          * @return int the message id
1963          */
1964         private function receive_reshare($importer, $data, $xml) {
1965                 $root_author = notags(unxmlify($data->root_author));
1966                 $root_guid = notags(unxmlify($data->root_guid));
1967                 $guid = notags(unxmlify($data->guid));
1968                 $author = notags(unxmlify($data->author));
1969                 $public = notags(unxmlify($data->public));
1970                 $created_at = notags(unxmlify($data->created_at));
1971
1972                 $contact = self::allowed_contact_by_handle($importer, $author, false);
1973                 if (!$contact)
1974                         return false;
1975
1976                 $message_id = self::message_exists($importer["uid"], $guid);
1977                 if ($message_id)
1978                         return $message_id;
1979
1980                 $original_item = self::original_item($root_guid, $root_author, $author);
1981                 if (!$original_item)
1982                         return false;
1983
1984                 $orig_url = App::get_baseurl()."/display/".$original_item["guid"];
1985
1986                 $datarray = array();
1987
1988                 $datarray["uid"] = $importer["uid"];
1989                 $datarray["contact-id"] = $contact["id"];
1990                 $datarray["network"]  = NETWORK_DIASPORA;
1991
1992                 $datarray["author-name"] = $contact["name"];
1993                 $datarray["author-link"] = $contact["url"];
1994                 $datarray["author-avatar"] = ((x($contact,"thumb")) ? $contact["thumb"] : $contact["photo"]);
1995
1996                 $datarray["owner-name"] = $datarray["author-name"];
1997                 $datarray["owner-link"] = $datarray["author-link"];
1998                 $datarray["owner-avatar"] = $datarray["author-avatar"];
1999
2000                 $datarray["guid"] = $guid;
2001                 $datarray["uri"] = $datarray["parent-uri"] = self::get_uri_from_guid($author, $guid);
2002
2003                 $datarray["verb"] = ACTIVITY_POST;
2004                 $datarray["gravity"] = GRAVITY_PARENT;
2005
2006                 $datarray["object"] = $xml;
2007
2008                 $prefix = share_header($original_item["author-name"], $original_item["author-link"], $original_item["author-avatar"],
2009                                         $original_item["guid"], $original_item["created"], $orig_url);
2010                 $datarray["body"] = $prefix.$original_item["body"]."[/share]";
2011
2012                 $datarray["tag"] = $original_item["tag"];
2013                 $datarray["app"]  = $original_item["app"];
2014
2015                 $datarray["plink"] = self::plink($author, $guid);
2016                 $datarray["private"] = (($public == "false") ? 1 : 0);
2017                 $datarray["changed"] = $datarray["created"] = $datarray["edited"] = datetime_convert("UTC", "UTC", $created_at);
2018
2019                 $datarray["object-type"] = $original_item["object-type"];
2020
2021                 self::fetch_guid($datarray);
2022                 $message_id = item_store($datarray);
2023
2024                 if ($message_id)
2025                         logger("Stored reshare ".$datarray["guid"]." with message id ".$message_id, LOGGER_DEBUG);
2026
2027                 return $message_id;
2028         }
2029
2030         /**
2031          * @brief Processes retractions
2032          *
2033          * @param array $importer Array of the importer user
2034          * @param array $contact The contact of the item owner
2035          * @param object $data The message object
2036          *
2037          * @return bool success
2038          */
2039         private function item_retraction($importer, $contact, $data) {
2040                 $target_type = notags(unxmlify($data->target_type));
2041                 $target_guid = notags(unxmlify($data->target_guid));
2042                 $author = notags(unxmlify($data->author));
2043
2044                 $person = self::person_by_handle($author);
2045                 if (!is_array($person)) {
2046                         logger("unable to find author detail for ".$author);
2047                         return false;
2048                 }
2049
2050                 $r = q("SELECT `id`, `parent`, `parent-uri`, `author-link` FROM `item` WHERE `guid` = '%s' AND `uid` = %d AND NOT `file` LIKE '%%[%%' LIMIT 1",
2051                         dbesc($target_guid),
2052                         intval($importer["uid"])
2053                 );
2054                 if (!$r)
2055                         return false;
2056
2057                 // Only delete it if the author really fits
2058                 if (!link_compare($r[0]["author-link"], $person["url"])) {
2059                         logger("Item author ".$r[0]["author-link"]." doesn't fit to expected contact ".$person["url"], LOGGER_DEBUG);
2060                         return false;
2061                 }
2062
2063                 // Check if the sender is the thread owner
2064                 $p = q("SELECT `id`, `author-link`, `origin` FROM `item` WHERE `id` = %d",
2065                         intval($r[0]["parent"]));
2066
2067                 // Only delete it if the parent author really fits
2068                 if (!link_compare($p[0]["author-link"], $contact["url"]) AND !link_compare($r[0]["author-link"], $contact["url"])) {
2069                         logger("Thread author ".$p[0]["author-link"]." and item author ".$r[0]["author-link"]." don't fit to expected contact ".$contact["url"], LOGGER_DEBUG);
2070                         return false;
2071                 }
2072
2073                 // Currently we don't have a central deletion function that we could use in this case. The function "item_drop" doesn't work for that case
2074                 q("UPDATE `item` SET `deleted` = 1, `edited` = '%s', `changed` = '%s', `body` = '' , `title` = '' WHERE `id` = %d",
2075                         dbesc(datetime_convert()),
2076                         dbesc(datetime_convert()),
2077                         intval($r[0]["id"])
2078                 );
2079                 delete_thread($r[0]["id"], $r[0]["parent-uri"]);
2080
2081                 logger("Deleted target ".$target_guid." (".$r[0]["id"].") from user ".$importer["uid"]." parent: ".$p[0]["id"], LOGGER_DEBUG);
2082
2083                 // Now check if the retraction needs to be relayed by us
2084                 if($p[0]["origin"]) {
2085                         // notify others
2086                         proc_run("php", "include/notifier.php", "drop", $r[0]["id"]);
2087                 }
2088
2089                 return true;
2090         }
2091
2092         /**
2093          * @brief Receives retraction messages
2094          *
2095          * @param array $importer Array of the importer user
2096          * @param string $sender The sender of the message
2097          * @param object $data The message object
2098          *
2099          * @return bool Success
2100          */
2101         private function receive_retraction($importer, $sender, $data) {
2102                 $target_type = notags(unxmlify($data->target_type));
2103
2104                 $contact = self::contact_by_handle($importer["uid"], $sender);
2105                 if (!$contact) {
2106                         logger("cannot find contact for sender: ".$sender." and user ".$importer["uid"]);
2107                         return false;
2108                 }
2109
2110                 logger("Got retraction for ".$target_type.", sender ".$sender." and user ".$importer["uid"], LOGGER_DEBUG);
2111
2112                 switch ($target_type) {
2113                         case "Comment":
2114                         case "Like":
2115                         case "Post": // "Post" will be supported in a future version
2116                         case "Reshare":
2117                         case "StatusMessage":
2118                                 return self::item_retraction($importer, $contact, $data);;
2119
2120                         case "Contact":
2121                         case "Person":
2122                                 /// @todo What should we do with an "unshare"?
2123                                 // Removing the contact isn't correct since we still can read the public items
2124                                 contact_remove($contact["id"]);
2125                                 return true;
2126
2127                         default:
2128                                 logger("Unknown target type ".$target_type);
2129                                 return false;
2130                 }
2131                 return true;
2132         }
2133
2134         /**
2135          * @brief Receives status messages
2136          *
2137          * @param array $importer Array of the importer user
2138          * @param object $data The message object
2139          * @param string $xml The original XML of the message
2140          *
2141          * @return int The message id of the newly created item
2142          */
2143         private function receive_status_message($importer, $data, $xml) {
2144
2145                 $raw_message = unxmlify($data->raw_message);
2146                 $guid = notags(unxmlify($data->guid));
2147                 $author = notags(unxmlify($data->author));
2148                 $public = notags(unxmlify($data->public));
2149                 $created_at = notags(unxmlify($data->created_at));
2150                 $provider_display_name = notags(unxmlify($data->provider_display_name));
2151
2152                 /// @todo enable support for polls
2153                 //if ($data->poll) {
2154                 //      foreach ($data->poll AS $poll)
2155                 //              print_r($poll);
2156                 //      die("poll!\n");
2157                 //}
2158                 $contact = self::allowed_contact_by_handle($importer, $author, false);
2159                 if (!$contact)
2160                         return false;
2161
2162                 $message_id = self::message_exists($importer["uid"], $guid);
2163                 if ($message_id)
2164                         return $message_id;
2165
2166                 $address = array();
2167                 if ($data->location)
2168                         foreach ($data->location->children() AS $fieldname => $data)
2169                                 $address[$fieldname] = notags(unxmlify($data));
2170
2171                 $body = diaspora2bb($raw_message);
2172
2173                 $datarray = array();
2174
2175                 // Attach embedded pictures to the body
2176                 if ($data->photo) {
2177                         foreach ($data->photo AS $photo)
2178                                 $body = "[img]".unxmlify($photo->remote_photo_path).
2179                                         unxmlify($photo->remote_photo_name)."[/img]\n".$body;
2180
2181                         $datarray["object-type"] = ACTIVITY_OBJ_PHOTO;
2182                 } else {
2183                         $datarray["object-type"] = ACTIVITY_OBJ_NOTE;
2184
2185                         // Add OEmbed and other information to the body
2186                         if (!self::is_redmatrix($contact["url"]))
2187                                 $body = add_page_info_to_body($body, false, true);
2188                 }
2189
2190                 $datarray["uid"] = $importer["uid"];
2191                 $datarray["contact-id"] = $contact["id"];
2192                 $datarray["network"] = NETWORK_DIASPORA;
2193
2194                 $datarray["author-name"] = $contact["name"];
2195                 $datarray["author-link"] = $contact["url"];
2196                 $datarray["author-avatar"] = ((x($contact,"thumb")) ? $contact["thumb"] : $contact["photo"]);
2197
2198                 $datarray["owner-name"] = $datarray["author-name"];
2199                 $datarray["owner-link"] = $datarray["author-link"];
2200                 $datarray["owner-avatar"] = $datarray["author-avatar"];
2201
2202                 $datarray["guid"] = $guid;
2203                 $datarray["uri"] = $datarray["parent-uri"] = self::get_uri_from_guid($author, $guid);
2204
2205                 $datarray["verb"] = ACTIVITY_POST;
2206                 $datarray["gravity"] = GRAVITY_PARENT;
2207
2208                 $datarray["object"] = $xml;
2209
2210                 $datarray["body"] = $body;
2211
2212                 if ($provider_display_name != "")
2213                         $datarray["app"] = $provider_display_name;
2214
2215                 $datarray["plink"] = self::plink($author, $guid);
2216                 $datarray["private"] = (($public == "false") ? 1 : 0);
2217                 $datarray["changed"] = $datarray["created"] = $datarray["edited"] = datetime_convert("UTC", "UTC", $created_at);
2218
2219                 if (isset($address["address"]))
2220                         $datarray["location"] = $address["address"];
2221
2222                 if (isset($address["lat"]) AND isset($address["lng"]))
2223                         $datarray["coord"] = $address["lat"]." ".$address["lng"];
2224
2225                 self::fetch_guid($datarray);
2226                 $message_id = item_store($datarray);
2227
2228                 if ($message_id)
2229                         logger("Stored item ".$datarray["guid"]." with message id ".$message_id, LOGGER_DEBUG);
2230
2231                 return $message_id;
2232         }
2233
2234         /* ************************************************************************************** *
2235          * Here are all the functions that are needed to transmit data with the Diaspora protocol *
2236          * ************************************************************************************** */
2237
2238         /**
2239          * @brief returnes the handle of a contact
2240          *
2241          * @param array $me contact array
2242          *
2243          * @return string the handle in the format user@domain.tld
2244          */
2245         private function my_handle($contact) {
2246                 if ($contact["addr"] != "")
2247                         return $contact["addr"];
2248
2249                 // Normally we should have a filled "addr" field - but in the past this wasn't the case
2250                 // So - just in case - we build the the address here.
2251                 if ($contact["nickname"] != "")
2252                         $nick = $contact["nickname"];
2253                 else
2254                         $nick = $contact["nick"];
2255
2256                 return $nick."@".substr(App::get_baseurl(), strpos(App::get_baseurl(),"://") + 3);
2257         }
2258
2259         /**
2260          * @brief Creates the envelope for a public message
2261          *
2262          * @param string $msg The message that is to be transmitted
2263          * @param array $user The record of the sender
2264          * @param array $contact Target of the communication
2265          * @param string $prvkey The private key of the sender
2266          * @param string $pubkey The public key of the receiver
2267          *
2268          * @return string The envelope
2269          */
2270         private function build_public_message($msg, $user, $contact, $prvkey, $pubkey) {
2271
2272                 logger("Message: ".$msg, LOGGER_DATA);
2273
2274                 $handle = self::my_handle($user);
2275
2276                 $b64url_data = base64url_encode($msg);
2277
2278                 $data = str_replace(array("\n", "\r", " ", "\t"), array("", "", "", ""), $b64url_data);
2279
2280                 $type = "application/xml";
2281                 $encoding = "base64url";
2282                 $alg = "RSA-SHA256";
2283
2284                 $signable_data = $data.".".base64url_encode($type).".".base64url_encode($encoding).".".base64url_encode($alg);
2285
2286                 $signature = rsa_sign($signable_data,$prvkey);
2287                 $sig = base64url_encode($signature);
2288
2289                 $xmldata = array("diaspora" => array("header" => array("author_id" => $handle),
2290                                                 "me:env" => array("me:encoding" => "base64url",
2291                                                                 "me:alg" => "RSA-SHA256",
2292                                                                 "me:data" => $data,
2293                                                                 "@attributes" => array("type" => "application/xml"),
2294                                                                 "me:sig" => $sig)));
2295
2296                 $namespaces = array("" => "https://joindiaspora.com/protocol",
2297                                 "me" => "http://salmon-protocol.org/ns/magic-env");
2298
2299                 $magic_env = xml::from_array($xmldata, $xml, false, $namespaces);
2300
2301                 logger("magic_env: ".$magic_env, LOGGER_DATA);
2302                 return $magic_env;
2303         }
2304
2305         /**
2306          * @brief Creates the envelope for a private message
2307          *
2308          * @param string $msg The message that is to be transmitted
2309          * @param array $user The record of the sender
2310          * @param array $contact Target of the communication
2311          * @param string $prvkey The private key of the sender
2312          * @param string $pubkey The public key of the receiver
2313          *
2314          * @return string The envelope
2315          */
2316         private function build_private_message($msg, $user, $contact, $prvkey, $pubkey) {
2317
2318                 logger("Message: ".$msg, LOGGER_DATA);
2319
2320                 // without a public key nothing will work
2321
2322                 if (!$pubkey) {
2323                         logger("pubkey missing: contact id: ".$contact["id"]);
2324                         return false;
2325                 }
2326
2327                 $inner_aes_key = random_string(32);
2328                 $b_inner_aes_key = base64_encode($inner_aes_key);
2329                 $inner_iv = random_string(16);
2330                 $b_inner_iv = base64_encode($inner_iv);
2331
2332                 $outer_aes_key = random_string(32);
2333                 $b_outer_aes_key = base64_encode($outer_aes_key);
2334                 $outer_iv = random_string(16);
2335                 $b_outer_iv = base64_encode($outer_iv);
2336
2337                 $handle = self::my_handle($user);
2338
2339                 $padded_data = pkcs5_pad($msg,16);
2340                 $inner_encrypted = mcrypt_encrypt(MCRYPT_RIJNDAEL_128, $inner_aes_key, $padded_data, MCRYPT_MODE_CBC, $inner_iv);
2341
2342                 $b64_data = base64_encode($inner_encrypted);
2343
2344
2345                 $b64url_data = base64url_encode($b64_data);
2346                 $data = str_replace(array("\n", "\r", " ", "\t"), array("", "", "", ""), $b64url_data);
2347
2348                 $type = "application/xml";
2349                 $encoding = "base64url";
2350                 $alg = "RSA-SHA256";
2351
2352                 $signable_data = $data.".".base64url_encode($type).".".base64url_encode($encoding).".".base64url_encode($alg);
2353
2354                 $signature = rsa_sign($signable_data,$prvkey);
2355                 $sig = base64url_encode($signature);
2356
2357                 $xmldata = array("decrypted_header" => array("iv" => $b_inner_iv,
2358                                                         "aes_key" => $b_inner_aes_key,
2359                                                         "author_id" => $handle));
2360
2361                 $decrypted_header = xml::from_array($xmldata, $xml, true);
2362                 $decrypted_header = pkcs5_pad($decrypted_header,16);
2363
2364                 $ciphertext = mcrypt_encrypt(MCRYPT_RIJNDAEL_128, $outer_aes_key, $decrypted_header, MCRYPT_MODE_CBC, $outer_iv);
2365
2366                 $outer_json = json_encode(array("iv" => $b_outer_iv, "key" => $b_outer_aes_key));
2367
2368                 $encrypted_outer_key_bundle = "";
2369                 openssl_public_encrypt($outer_json, $encrypted_outer_key_bundle, $pubkey);
2370
2371                 $b64_encrypted_outer_key_bundle = base64_encode($encrypted_outer_key_bundle);
2372
2373                 logger("outer_bundle: ".$b64_encrypted_outer_key_bundle." key: ".$pubkey, LOGGER_DATA);
2374
2375                 $encrypted_header_json_object = json_encode(array("aes_key" => base64_encode($encrypted_outer_key_bundle),
2376                                                                 "ciphertext" => base64_encode($ciphertext)));
2377                 $cipher_json = base64_encode($encrypted_header_json_object);
2378
2379                 $xmldata = array("diaspora" => array("encrypted_header" => $cipher_json,
2380                                                 "me:env" => array("me:encoding" => "base64url",
2381                                                                 "me:alg" => "RSA-SHA256",
2382                                                                 "me:data" => $data,
2383                                                                 "@attributes" => array("type" => "application/xml"),
2384                                                                 "me:sig" => $sig)));
2385
2386                 $namespaces = array("" => "https://joindiaspora.com/protocol",
2387                                 "me" => "http://salmon-protocol.org/ns/magic-env");
2388
2389                 $magic_env = xml::from_array($xmldata, $xml, false, $namespaces);
2390
2391                 logger("magic_env: ".$magic_env, LOGGER_DATA);
2392                 return $magic_env;
2393         }
2394
2395         /**
2396          * @brief Create the envelope for a message
2397          *
2398          * @param string $msg The message that is to be transmitted
2399          * @param array $user The record of the sender
2400          * @param array $contact Target of the communication
2401          * @param string $prvkey The private key of the sender
2402          * @param string $pubkey The public key of the receiver
2403          * @param bool $public Is the message public?
2404          *
2405          * @return string The message that will be transmitted to other servers
2406          */
2407         private function build_message($msg, $user, $contact, $prvkey, $pubkey, $public = false) {
2408
2409                 if ($public)
2410                         $magic_env =  self::build_public_message($msg,$user,$contact,$prvkey,$pubkey);
2411                 else
2412                         $magic_env =  self::build_private_message($msg,$user,$contact,$prvkey,$pubkey);
2413
2414                 // The data that will be transmitted is double encoded via "urlencode", strange ...
2415                 $slap = "xml=".urlencode(urlencode($magic_env));
2416                 return $slap;
2417         }
2418
2419         /**
2420          * @brief Creates a signature for a message
2421          *
2422          * @param array $owner the array of the owner of the message
2423          * @param array $message The message that is to be signed
2424          *
2425          * @return string The signature
2426          */
2427         private function signature($owner, $message) {
2428                 $sigmsg = $message;
2429                 unset($sigmsg["author_signature"]);
2430                 unset($sigmsg["parent_author_signature"]);
2431
2432                 $signed_text = implode(";", $sigmsg);
2433
2434                 return base64_encode(rsa_sign($signed_text, $owner["uprvkey"], "sha256"));
2435         }
2436
2437         /**
2438          * @brief Transmit a message to a target server
2439          *
2440          * @param array $owner the array of the item owner
2441          * @param array $contact Target of the communication
2442          * @param string $slap The message that is to be transmitted
2443          * @param bool $public_batch Is it a public post?
2444          * @param bool $queue_run Is the transmission called from the queue?
2445          * @param string $guid message guid
2446          *
2447          * @return int Result of the transmission
2448          */
2449         public static function transmit($owner, $contact, $slap, $public_batch, $queue_run=false, $guid = "") {
2450
2451                 $a = get_app();
2452
2453                 $enabled = intval(get_config("system", "diaspora_enabled"));
2454                 if(!$enabled)
2455                         return 200;
2456
2457                 $logid = random_string(4);
2458                 $dest_url = (($public_batch) ? $contact["batch"] : $contact["notify"]);
2459                 if (!$dest_url) {
2460                         logger("no url for contact: ".$contact["id"]." batch mode =".$public_batch);
2461                         return 0;
2462                 }
2463
2464                 logger("transmit: ".$logid."-".$guid." ".$dest_url);
2465
2466                 if (!$queue_run && was_recently_delayed($contact["id"])) {
2467                         $return_code = 0;
2468                 } else {
2469                         if (!intval(get_config("system", "diaspora_test"))) {
2470                                 post_url($dest_url."/", $slap);
2471                                 $return_code = $a->get_curl_code();
2472                         } else {
2473                                 logger("test_mode");
2474                                 return 200;
2475                         }
2476                 }
2477
2478                 logger("transmit: ".$logid."-".$guid." returns: ".$return_code);
2479
2480                 if(!$return_code || (($return_code == 503) && (stristr($a->get_curl_headers(), "retry-after")))) {
2481                         logger("queue message");
2482
2483                         $r = q("SELECT `id` FROM `queue` WHERE `cid` = %d AND `network` = '%s' AND `content` = '%s' AND `batch` = %d LIMIT 1",
2484                                 intval($contact["id"]),
2485                                 dbesc(NETWORK_DIASPORA),
2486                                 dbesc($slap),
2487                                 intval($public_batch)
2488                         );
2489                         if($r) {
2490                                 logger("add_to_queue ignored - identical item already in queue");
2491                         } else {
2492                                 // queue message for redelivery
2493                                 add_to_queue($contact["id"], NETWORK_DIASPORA, $slap, $public_batch);
2494                         }
2495                 }
2496
2497                 return(($return_code) ? $return_code : (-1));
2498         }
2499
2500
2501         /**
2502          * @brief Builds and transmit messages
2503          *
2504          * @param array $owner the array of the item owner
2505          * @param array $contact Target of the communication
2506          * @param string $type The message type
2507          * @param array $message The message data
2508          * @param bool $public_batch Is it a public post?
2509          * @param string $guid message guid
2510          * @param bool $spool Should the transmission be spooled or transmitted?
2511          *
2512          * @return int Result of the transmission
2513          */
2514         private function build_and_transmit($owner, $contact, $type, $message, $public_batch = false, $guid = "", $spool = false) {
2515
2516                 $data = array("XML" => array("post" => array($type => $message)));
2517
2518                 $msg = xml::from_array($data, $xml);
2519
2520                 logger('message: '.$msg, LOGGER_DATA);
2521                 logger('send guid '.$guid, LOGGER_DEBUG);
2522
2523                 $slap = self::build_message($msg, $owner, $contact, $owner['uprvkey'], $contact['pubkey'], $public_batch);
2524
2525                 if ($spool) {
2526                         add_to_queue($contact['id'], NETWORK_DIASPORA, $slap, $public_batch);
2527                         return true;
2528                 } else
2529                         $return_code = self::transmit($owner, $contact, $slap, $public_batch, false, $guid);
2530
2531                 logger("guid: ".$item["guid"]." result ".$return_code, LOGGER_DEBUG);
2532
2533                 return $return_code;
2534         }
2535
2536         /**
2537          * @brief Sends a "share" message
2538          *
2539          * @param array $owner the array of the item owner
2540          * @param array $contact Target of the communication
2541          *
2542          * @return int The result of the transmission
2543          */
2544         public static function send_share($owner,$contact) {
2545
2546                 $message = array("sender_handle" => self::my_handle($owner),
2547                                 "recipient_handle" => $contact["addr"]);
2548
2549                 return self::build_and_transmit($owner, $contact, "request", $message);
2550         }
2551
2552         /**
2553          * @brief sends an "unshare"
2554          *
2555          * @param array $owner the array of the item owner
2556          * @param array $contact Target of the communication
2557          *
2558          * @return int The result of the transmission
2559          */
2560         public static function send_unshare($owner,$contact) {
2561
2562                 $message = array("post_guid" => $owner["guid"],
2563                                 "diaspora_handle" => self::my_handle($owner),
2564                                 "type" => "Person");
2565
2566                 return self::build_and_transmit($owner, $contact, "retraction", $message);
2567         }
2568
2569         /**
2570          * @brief Checks a message body if it is a reshare
2571          *
2572          * @param string $body The message body that is to be check
2573          * @param bool $complete Should it be a complete check or a simple check?
2574          *
2575          * @return array|bool Reshare details or "false" if no reshare
2576          */
2577         public static function is_reshare($body, $complete = true) {
2578                 $body = trim($body);
2579
2580                 // Skip if it isn't a pure repeated messages
2581                 // Does it start with a share?
2582                 if ((strpos($body, "[share") > 0) AND $complete)
2583                         return(false);
2584
2585                 // Does it end with a share?
2586                 if (strlen($body) > (strrpos($body, "[/share]") + 8))
2587                         return(false);
2588
2589                 $attributes = preg_replace("/\[share(.*?)\]\s?(.*?)\s?\[\/share\]\s?/ism","$1",$body);
2590                 // Skip if there is no shared message in there
2591                 if ($body == $attributes)
2592                         return(false);
2593
2594                 // If we don't do the complete check we quit here
2595                 if (!$complete)
2596                         return true;
2597
2598                 $guid = "";
2599                 preg_match("/guid='(.*?)'/ism", $attributes, $matches);
2600                 if ($matches[1] != "")
2601                         $guid = $matches[1];
2602
2603                 preg_match('/guid="(.*?)"/ism', $attributes, $matches);
2604                 if ($matches[1] != "")
2605                         $guid = $matches[1];
2606
2607                 if ($guid != "") {
2608                         $r = q("SELECT `contact-id` FROM `item` WHERE `guid` = '%s' AND `network` IN ('%s', '%s') LIMIT 1",
2609                                 dbesc($guid), NETWORK_DFRN, NETWORK_DIASPORA);
2610                         if ($r) {
2611                                 $ret= array();
2612                                 $ret["root_handle"] = self::handle_from_contact($r[0]["contact-id"]);
2613                                 $ret["root_guid"] = $guid;
2614                                 return($ret);
2615                         }
2616                 }
2617
2618                 $profile = "";
2619                 preg_match("/profile='(.*?)'/ism", $attributes, $matches);
2620                 if ($matches[1] != "")
2621                         $profile = $matches[1];
2622
2623                 preg_match('/profile="(.*?)"/ism', $attributes, $matches);
2624                 if ($matches[1] != "")
2625                         $profile = $matches[1];
2626
2627                 $ret= array();
2628
2629                 $ret["root_handle"] = preg_replace("=https?://(.*)/u/(.*)=ism", "$2@$1", $profile);
2630                 if (($ret["root_handle"] == $profile) OR ($ret["root_handle"] == ""))
2631                         return(false);
2632
2633                 $link = "";
2634                 preg_match("/link='(.*?)'/ism", $attributes, $matches);
2635                 if ($matches[1] != "")
2636                         $link = $matches[1];
2637
2638                 preg_match('/link="(.*?)"/ism', $attributes, $matches);
2639                 if ($matches[1] != "")
2640                         $link = $matches[1];
2641
2642                 $ret["root_guid"] = preg_replace("=https?://(.*)/posts/(.*)=ism", "$2", $link);
2643                 if (($ret["root_guid"] == $link) OR (trim($ret["root_guid"]) == ""))
2644                         return(false);
2645
2646                 return($ret);
2647         }
2648
2649         /**
2650          * @brief Sends a post
2651          *
2652          * @param array $item The item that will be exported
2653          * @param array $owner the array of the item owner
2654          * @param array $contact Target of the communication
2655          * @param bool $public_batch Is it a public post?
2656          *
2657          * @return int The result of the transmission
2658          */
2659         public static function send_status($item, $owner, $contact, $public_batch = false) {
2660
2661                 $myaddr = self::my_handle($owner);
2662
2663                 $public = (($item["private"]) ? "false" : "true");
2664
2665                 $created = datetime_convert("UTC", "UTC", $item["created"], 'Y-m-d H:i:s \U\T\C');
2666
2667                 // Detect a share element and do a reshare
2668                 if (!$item['private'] AND ($ret = self::is_reshare($item["body"]))) {
2669                         $message = array("root_diaspora_id" => $ret["root_handle"],
2670                                         "root_guid" => $ret["root_guid"],
2671                                         "guid" => $item["guid"],
2672                                         "diaspora_handle" => $myaddr,
2673                                         "public" => $public,
2674                                         "created_at" => $created,
2675                                         "provider_display_name" => $item["app"]);
2676
2677                         $type = "reshare";
2678                 } else {
2679                         $title = $item["title"];
2680                         $body = $item["body"];
2681
2682                         // convert to markdown
2683                         $body = html_entity_decode(bb2diaspora($body));
2684
2685                         // Adding the title
2686                         if(strlen($title))
2687                                 $body = "## ".html_entity_decode($title)."\n\n".$body;
2688
2689                         if ($item["attach"]) {
2690                                 $cnt = preg_match_all('/href=\"(.*?)\"(.*?)title=\"(.*?)\"/ism', $item["attach"], $matches, PREG_SET_ORDER);
2691                                 if(cnt) {
2692                                         $body .= "\n".t("Attachments:")."\n";
2693                                         foreach($matches as $mtch)
2694                                                 $body .= "[".$mtch[3]."](".$mtch[1].")\n";
2695                                 }
2696                         }
2697
2698                         $location = array();
2699
2700                         if ($item["location"] != "")
2701                                 $location["address"] = $item["location"];
2702
2703                         if ($item["coord"] != "") {
2704                                 $coord = explode(" ", $item["coord"]);
2705                                 $location["lat"] = $coord[0];
2706                                 $location["lng"] = $coord[1];
2707                         }
2708
2709                         $message = array("raw_message" => $body,
2710                                         "location" => $location,
2711                                         "guid" => $item["guid"],
2712                                         "diaspora_handle" => $myaddr,
2713                                         "public" => $public,
2714                                         "created_at" => $created,
2715                                         "provider_display_name" => $item["app"]);
2716
2717                         if (count($location) == 0)
2718                                 unset($message["location"]);
2719
2720                         $type = "status_message";
2721                 }
2722
2723                 return self::build_and_transmit($owner, $contact, $type, $message, $public_batch, $item["guid"]);
2724         }
2725
2726         /**
2727          * @brief Creates a "like" object
2728          *
2729          * @param array $item The item that will be exported
2730          * @param array $owner the array of the item owner
2731          *
2732          * @return array The data for a "like"
2733          */
2734         private function construct_like($item, $owner) {
2735
2736                 $p = q("SELECT `guid`, `uri`, `parent-uri` FROM `item` WHERE `uri` = '%s' LIMIT 1",
2737                         dbesc($item["thr-parent"]));
2738                 if(!$p)
2739                         return false;
2740
2741                 $parent = $p[0];
2742
2743                 $target_type = ($parent["uri"] === $parent["parent-uri"] ? "Post" : "Comment");
2744                 $positive = "true";
2745
2746                 return(array("positive" => $positive,
2747                                 "guid" => $item["guid"],
2748                                 "target_type" => $target_type,
2749                                 "parent_guid" => $parent["guid"],
2750                                 "author_signature" => "",
2751                                 "diaspora_handle" => self::my_handle($owner)));
2752         }
2753
2754         /**
2755          * @brief Creates the object for a comment
2756          *
2757          * @param array $item The item that will be exported
2758          * @param array $owner the array of the item owner
2759          *
2760          * @return array The data for a comment
2761          */
2762         private function construct_comment($item, $owner) {
2763
2764                 $p = q("SELECT `guid` FROM `item` WHERE `parent` = %d AND `id` = %d LIMIT 1",
2765                         intval($item["parent"]),
2766                         intval($item["parent"])
2767                 );
2768
2769                 if (!$p)
2770                         return false;
2771
2772                 $parent = $p[0];
2773
2774                 $text = html_entity_decode(bb2diaspora($item["body"]));
2775
2776                 return(array("guid" => $item["guid"],
2777                                 "parent_guid" => $parent["guid"],
2778                                 "author_signature" => "",
2779                                 "text" => $text,
2780                                 "diaspora_handle" => self::my_handle($owner)));
2781         }
2782
2783         /**
2784          * @brief Send a like or a comment
2785          *
2786          * @param array $item The item that will be exported
2787          * @param array $owner the array of the item owner
2788          * @param array $contact Target of the communication
2789          * @param bool $public_batch Is it a public post?
2790          *
2791          * @return int The result of the transmission
2792          */
2793         public static function send_followup($item,$owner,$contact,$public_batch = false) {
2794
2795                 if($item['verb'] === ACTIVITY_LIKE) {
2796                         $message = self::construct_like($item, $owner);
2797                         $type = "like";
2798                 } else {
2799                         $message = self::construct_comment($item, $owner);
2800                         $type = "comment";
2801                 }
2802
2803                 if (!$message)
2804                         return false;
2805
2806                 $message["author_signature"] = self::signature($owner, $message);
2807
2808                 return self::build_and_transmit($owner, $contact, $type, $message, $public_batch, $item["guid"]);
2809         }
2810
2811         /**
2812          * @brief Creates a message from a signature record entry
2813          *
2814          * @param array $item The item that will be exported
2815          * @param array $signature The entry of the "sign" record
2816          *
2817          * @return string The message
2818          */
2819         private function message_from_signature($item, $signature) {
2820
2821                 // Split the signed text
2822                 $signed_parts = explode(";", $signature['signed_text']);
2823
2824                 if ($item["deleted"])
2825                         $message = array("parent_author_signature" => "",
2826                                         "target_guid" => $signed_parts[0],
2827                                         "target_type" => $signed_parts[1],
2828                                         "sender_handle" => $signature['signer'],
2829                                         "target_author_signature" => $signature['signature']);
2830                 elseif ($item['verb'] === ACTIVITY_LIKE)
2831                         $message = array("positive" => $signed_parts[0],
2832                                         "guid" => $signed_parts[1],
2833                                         "target_type" => $signed_parts[2],
2834                                         "parent_guid" => $signed_parts[3],
2835                                         "parent_author_signature" => "",
2836                                         "author_signature" => $signature['signature'],
2837                                         "diaspora_handle" => $signed_parts[4]);
2838                 else {
2839                         // Remove the comment guid
2840                         $guid = array_shift($signed_parts);
2841
2842                         // Remove the parent guid
2843                         $parent_guid = array_shift($signed_parts);
2844
2845                         // Remove the handle
2846                         $handle = array_pop($signed_parts);
2847
2848                         // Glue the parts together
2849                         $text = implode(";", $signed_parts);
2850
2851                         $message = array("guid" => $guid,
2852                                         "parent_guid" => $parent_guid,
2853                                         "parent_author_signature" => "",
2854                                         "author_signature" => $signature['signature'],
2855                                         "text" => implode(";", $signed_parts),
2856                                         "diaspora_handle" => $handle);
2857                 }
2858                 return $message;
2859         }
2860
2861         /**
2862          * @brief Relays messages (like, comment, retraction) to other servers if we are the thread owner
2863          *
2864          * @param array $item The item that will be exported
2865          * @param array $owner the array of the item owner
2866          * @param array $contact Target of the communication
2867          * @param bool $public_batch Is it a public post?
2868          *
2869          * @return int The result of the transmission
2870          */
2871         public static function send_relay($item, $owner, $contact, $public_batch = false) {
2872
2873                 if ($item["deleted"])
2874                         return self::send_retraction($item, $owner, $contact, $public_batch, true);
2875                 elseif ($item['verb'] === ACTIVITY_LIKE)
2876                         $type = "like";
2877                 else
2878                         $type = "comment";
2879
2880                 logger("Got relayable data ".$type." for item ".$item["guid"]." (".$item["id"].")", LOGGER_DEBUG);
2881
2882                 // fetch the original signature
2883
2884                 $r = q("SELECT `signed_text`, `signature`, `signer` FROM `sign` WHERE `iid` = %d LIMIT 1",
2885                         intval($item["id"]));
2886
2887                 if (!$r) {
2888                         logger("Couldn't fetch signatur for item ".$item["guid"]." (".$item["id"].")", LOGGER_DEBUG);
2889                         return false;
2890                 }
2891
2892                 $signature = $r[0];
2893
2894                 // Old way - is used by the internal Friendica functions
2895                 /// @todo Change all signatur storing functions to the new format
2896                 if ($signature['signed_text'] AND $signature['signature'] AND $signature['signer'])
2897                         $message = self::message_from_signature($item, $signature);
2898                 else {// New way
2899                         $msg = json_decode($signature['signed_text'], true);
2900
2901                         $message = array();
2902                         if (is_array($msg)) {
2903                                 foreach ($msg AS $field => $data) {
2904                                         if (!$item["deleted"]) {
2905                                                 if ($field == "author")
2906                                                         $field = "diaspora_handle";
2907                                                 if ($field == "parent_type")
2908                                                         $field = "target_type";
2909                                         }
2910
2911                                         $message[$field] = $data;
2912                                 }
2913                         } else
2914                                 logger("Signature text for item ".$item["guid"]." (".$item["id"].") couldn't be extracted: ".$signature['signed_text'], LOGGER_DEBUG);
2915                 }
2916
2917                 $message["parent_author_signature"] = self::signature($owner, $message);
2918
2919                 logger("Relayed data ".print_r($message, true), LOGGER_DEBUG);
2920
2921                 return self::build_and_transmit($owner, $contact, $type, $message, $public_batch, $item["guid"]);
2922         }
2923
2924         /**
2925          * @brief Sends a retraction (deletion) of a message, like or comment
2926          *
2927          * @param array $item The item that will be exported
2928          * @param array $owner the array of the item owner
2929          * @param array $contact Target of the communication
2930          * @param bool $public_batch Is it a public post?
2931          * @param bool $relay Is the retraction transmitted from a relay?
2932          *
2933          * @return int The result of the transmission
2934          */
2935         public static function send_retraction($item, $owner, $contact, $public_batch = false, $relay = false) {
2936
2937                 $itemaddr = self::handle_from_contact($item["contact-id"], $item["gcontact-id"]);
2938
2939                 // Check whether the retraction is for a top-level post or whether it's a relayable
2940                 if ($item["uri"] !== $item["parent-uri"]) {
2941                         $msg_type = "relayable_retraction";
2942                         $target_type = (($item["verb"] === ACTIVITY_LIKE) ? "Like" : "Comment");
2943                 } else {
2944                         $msg_type = "signed_retraction";
2945                         $target_type = "StatusMessage";
2946                 }
2947
2948                 if ($relay AND ($item["uri"] !== $item["parent-uri"]))
2949                         $signature = "parent_author_signature";
2950                 else
2951                         $signature = "target_author_signature";
2952
2953                 $signed_text = $item["guid"].";".$target_type;
2954
2955                 $message = array("target_guid" => $item['guid'],
2956                                 "target_type" => $target_type,
2957                                 "sender_handle" => $itemaddr,
2958                                 $signature => base64_encode(rsa_sign($signed_text,$owner['uprvkey'],'sha256')));
2959
2960                 logger("Got message ".print_r($message, true), LOGGER_DEBUG);
2961
2962                 return self::build_and_transmit($owner, $contact, $msg_type, $message, $public_batch, $item["guid"]);
2963         }
2964
2965         /**
2966          * @brief Sends a mail
2967          *
2968          * @param array $item The item that will be exported
2969          * @param array $owner The owner
2970          * @param array $contact Target of the communication
2971          *
2972          * @return int The result of the transmission
2973          */
2974         public static function send_mail($item, $owner, $contact) {
2975
2976                 $myaddr = self::my_handle($owner);
2977
2978                 $r = q("SELECT * FROM `conv` WHERE `id` = %d AND `uid` = %d LIMIT 1",
2979                         intval($item["convid"]),
2980                         intval($item["uid"])
2981                 );
2982
2983                 if (!$r) {
2984                         logger("conversation not found.");
2985                         return;
2986                 }
2987                 $cnv = $r[0];
2988
2989                 $conv = array(
2990                         "guid" => $cnv["guid"],
2991                         "subject" => $cnv["subject"],
2992                         "created_at" => datetime_convert("UTC", "UTC", $cnv['created'], 'Y-m-d H:i:s \U\T\C'),
2993                         "diaspora_handle" => $cnv["creator"],
2994                         "participant_handles" => $cnv["recips"]
2995                 );
2996
2997                 $body = bb2diaspora($item["body"]);
2998                 $created = datetime_convert("UTC", "UTC", $item["created"], 'Y-m-d H:i:s \U\T\C');
2999
3000                 $signed_text = $item["guid"].";".$cnv["guid"].";".$body.";".$created.";".$myaddr.";".$cnv['guid'];
3001                 $sig = base64_encode(rsa_sign($signed_text, $owner["uprvkey"], "sha256"));
3002
3003                 $msg = array(
3004                         "guid" => $item["guid"],
3005                         "parent_guid" => $cnv["guid"],
3006                         "parent_author_signature" => $sig,
3007                         "author_signature" => $sig,
3008                         "text" => $body,
3009                         "created_at" => $created,
3010                         "diaspora_handle" => $myaddr,
3011                         "conversation_guid" => $cnv["guid"]
3012                 );
3013
3014                 if ($item["reply"]) {
3015                         $message = $msg;
3016                         $type = "message";
3017                 } else {
3018                         $message = array("guid" => $cnv["guid"],
3019                                         "subject" => $cnv["subject"],
3020                                         "created_at" => datetime_convert("UTC", "UTC", $cnv['created'], 'Y-m-d H:i:s \U\T\C'),
3021                                         "message" => $msg,
3022                                         "diaspora_handle" => $cnv["creator"],
3023                                         "participant_handles" => $cnv["recips"]);
3024
3025                         $type = "conversation";
3026                 }
3027
3028                 return self::build_and_transmit($owner, $contact, $type, $message, false, $item["guid"]);
3029         }
3030
3031         /**
3032          * @brief Sends profile data
3033          *
3034          * @param int $uid The user id
3035          */
3036         public static function send_profile($uid) {
3037
3038                 if (!$uid)
3039                         return;
3040
3041                 $recips = q("SELECT `id`,`name`,`network`,`pubkey`,`notify` FROM `contact` WHERE `network` = '%s'
3042                         AND `uid` = %d AND `rel` != %d",
3043                         dbesc(NETWORK_DIASPORA),
3044                         intval($uid),
3045                         intval(CONTACT_IS_SHARING)
3046                 );
3047                 if (!$recips)
3048                         return;
3049
3050                 $r = q("SELECT `profile`.`uid` AS `profile_uid`, `profile`.* , `user`.*, `user`.`prvkey` AS `uprvkey`, `contact`.`addr`
3051                         FROM `profile`
3052                         INNER JOIN `user` ON `profile`.`uid` = `user`.`uid`
3053                         INNER JOIN `contact` ON `profile`.`uid` = `contact`.`uid`
3054                         WHERE `user`.`uid` = %d AND `profile`.`is-default` AND `contact`.`self` LIMIT 1",
3055                         intval($uid)
3056                 );
3057
3058                 if (!$r)
3059                         return;
3060
3061                 $profile = $r[0];
3062
3063                 $handle = $profile["addr"];
3064                 $first = ((strpos($profile['name'],' ')
3065                         ? trim(substr($profile['name'],0,strpos($profile['name'],' '))) : $profile['name']));
3066                 $last = (($first === $profile['name']) ? '' : trim(substr($profile['name'], strlen($first))));
3067                 $large = App::get_baseurl().'/photo/custom/300/'.$profile['uid'].'.jpg';
3068                 $medium = App::get_baseurl().'/photo/custom/100/'.$profile['uid'].'.jpg';
3069                 $small = App::get_baseurl().'/photo/custom/50/'  .$profile['uid'].'.jpg';
3070                 $searchable = (($profile['publish'] && $profile['net-publish']) ? 'true' : 'false');
3071
3072                 if ($searchable === 'true') {
3073                         $dob = '1000-00-00';
3074
3075                         if (($profile['dob']) && ($profile['dob'] != '0000-00-00'))
3076                                 $dob = ((intval($profile['dob'])) ? intval($profile['dob']) : '1000') .'-'. datetime_convert('UTC','UTC',$profile['dob'],'m-d');
3077
3078                         $about = $profile['about'];
3079                         $about = strip_tags(bbcode($about));
3080
3081                         $location = formatted_location($profile);
3082                         $tags = '';
3083                         if ($profile['pub_keywords']) {
3084                                 $kw = str_replace(',',' ',$profile['pub_keywords']);
3085                                 $kw = str_replace('  ',' ',$kw);
3086                                 $arr = explode(' ',$profile['pub_keywords']);
3087                                 if (count($arr)) {
3088                                         for($x = 0; $x < 5; $x ++) {
3089                                                 if (trim($arr[$x]))
3090                                                         $tags .= '#'. trim($arr[$x]) .' ';
3091                                         }
3092                                 }
3093                         }
3094                         $tags = trim($tags);
3095                 }
3096
3097                 $message = array("diaspora_handle" => $handle,
3098                                 "first_name" => $first,
3099                                 "last_name" => $last,
3100                                 "image_url" => $large,
3101                                 "image_url_medium" => $medium,
3102                                 "image_url_small" => $small,
3103                                 "birthday" => $dob,
3104                                 "gender" => $profile['gender'],
3105                                 "bio" => $about,
3106                                 "location" => $location,
3107                                 "searchable" => $searchable,
3108                                 "tag_string" => $tags);
3109
3110                 foreach($recips as $recip)
3111                         self::build_and_transmit($profile, $recip, "profile", $message, false, "", true);
3112         }
3113
3114         /**
3115          * @brief Stores the signature for likes that are created on our system
3116          *
3117          * @param array $contact The contact array of the "like"
3118          * @param int $post_id The post id of the "like"
3119          *
3120          * @return bool Success
3121          */
3122         public static function store_like_signature($contact, $post_id) {
3123
3124                 // Is the contact the owner? Then fetch the private key
3125                 if (!$contact['self'] OR ($contact['uid'] == 0)) {
3126                         logger("No owner post, so not storing signature", LOGGER_DEBUG);
3127                         return false;
3128                 }
3129
3130                 $r = q("SELECT `prvkey` FROM `user` WHERE `uid` = %d LIMIT 1", intval($contact['uid']));
3131                 if(!$r)
3132                         return false;
3133
3134                 $contact["uprvkey"] = $r[0]['prvkey'];
3135
3136                 $r = q("SELECT * FROM `item` WHERE `id` = %d LIMIT 1", intval($post_id));
3137                 if (!$r)
3138                         return false;
3139
3140                 if (!in_array($r[0]["verb"], array(ACTIVITY_LIKE, ACTIVITY_DISLIKE)))
3141                         return false;
3142
3143                 $message = self::construct_like($r[0], $contact);
3144                 $message["author_signature"] = self::signature($contact, $message);
3145
3146                 // In the future we will store the signature more flexible to support new fields.
3147                 // Right now we cannot change this since old Friendica versions (prior to 3.5) can only handle this format.
3148                 // (We are transmitting this data here via DFRN)
3149
3150                 $signed_text = $message["positive"].";".$message["guid"].";".$message["target_type"].";".
3151                                 $message["parent_guid"].";".$message["diaspora_handle"];
3152
3153                 q("INSERT INTO `sign` (`iid`,`signed_text`,`signature`,`signer`) VALUES (%d,'%s','%s','%s')",
3154                         intval($post_id),
3155                         dbesc($signed_text),
3156                         dbesc($message["author_signature"]),
3157                         dbesc($message["diaspora_handle"])
3158                 );
3159
3160                 // This here will replace the lines above, once Diaspora changed its protocol
3161                 //q("INSERT INTO `sign` (`iid`,`signed_text`) VALUES (%d,'%s')",
3162                 //      intval($message_id),
3163                 //      dbesc(json_encode($message))
3164                 //);
3165
3166                 logger('Stored diaspora like signature');
3167                 return true;
3168         }
3169
3170         /**
3171          * @brief Stores the signature for comments that are created on our system
3172          *
3173          * @param array $item The item array of the comment
3174          * @param array $contact The contact array of the item owner
3175          * @param string $uprvkey The private key of the sender
3176          * @param int $message_id The message id of the comment
3177          *
3178          * @return bool Success
3179          */
3180         public static function store_comment_signature($item, $contact, $uprvkey, $message_id) {
3181
3182                 if ($uprvkey == "") {
3183                         logger('No private key, so not storing comment signature', LOGGER_DEBUG);
3184                         return false;
3185                 }
3186
3187                 $contact["uprvkey"] = $uprvkey;
3188
3189                 $message = self::construct_comment($item, $contact);
3190                 $message["author_signature"] = self::signature($contact, $message);
3191
3192                 // In the future we will store the signature more flexible to support new fields.
3193                 // Right now we cannot change this since old Friendica versions (prior to 3.5) can only handle this format.
3194                 // (We are transmitting this data here via DFRN)
3195                 $signed_text = $message["guid"].";".$message["parent_guid"].";".
3196                                 $message["text"].";".$message["diaspora_handle"];
3197
3198                 q("INSERT INTO `sign` (`iid`,`signed_text`,`signature`,`signer`) VALUES (%d,'%s','%s','%s')",
3199                         intval($message_id),
3200                         dbesc($signed_text),
3201                         dbesc($message["author_signature"]),
3202                         dbesc($message["diaspora_handle"])
3203                 );
3204
3205                 // This here will replace the lines above, once Diaspora changed its protocol
3206                 //q("INSERT INTO `sign` (`iid`,`signed_text`) VALUES (%d,'%s')",
3207                 //      intval($message_id),
3208                 //      dbesc(json_encode($message))
3209                 //);
3210
3211                 logger('Stored diaspora comment signature');
3212                 return true;
3213         }
3214 }
3215 ?>